Pelopy 4 Pcs Black Aluminum Pyramid Post Caps for True Wood/Metal Fence Posts of Decks or Corridors Mailbox Pyramid Cover

A small upgrade that pays off

I installed these Pelopy aluminum pyramid post caps across a run of square posts on a side-yard fence and on a couple of exposed gate posts. It’s a simple accessory, but on day one the line looked more finished and, more importantly, the post tops were protected from water. After living with them and doing a couple of additional installs for neighbors, I’ve got a clear sense of where these caps shine and where you’ll want to be careful with fit.

Build quality and finish

Each cap is stamped/form-pressed aluminum with a powder-coated black finish. The metal is on the thicker side for this category (about 1.2 mm), which gives the caps a more substantial feel than the common plastic push-on style and less “tinny” flex when you squeeze the sides. The seams are tight and consistent, the pyramid apexes were centered, and the edges weren’t razor sharp—good details if you’re tapping them on by hand.

The finish on my set reads as a soft gloss—more sheen than a matte architectural black, less than a mirror gloss. It looks clean and contemporary, and it wipes down easily. I dinged one cap on concrete to see how the coating would behave; it scuffed but didn’t spider or flake, which is what I want from a powder coat on aluminum.

Dimensions on my calipers were in line with spec: the inside opening measured right around 2.09 inches square, the skirt (the part that actually grips the post) was roughly 0.63 inches tall, and the overall cap height about 1.22 inches. That skirt height matters if you’re using them to mask minor imperfections at the top of a post—it’ll hide light dings and saw kerf marks but not tall welds or large out-of-square cuts.

The fit question: true 2x2 isn’t nominal 2x2

Compatibility is where most folks will either love these or get frustrated. These are designed for true 2-inch square posts. That means:

• They will not fit nominal “2x2” dimensional lumber, which is 1.5 x 1.5 inches.
• They will sit a hair loose on posts that are exactly 2.00 inches outside dimension unless you secure them.
• They may feel tight on posts that are slightly oversized from thick paint, galvanizing, or coatings.

On my installs:

• On 2.00-inch square steel tube posts, the caps slipped on with slight play. A small bead of exterior-grade silicone inside the skirt locked them down. After curing, they were rock solid and didn’t rattle in wind.
• On powder-coated steel posts that measured about 2.04–2.05 inches, they required a few taps from a rubber mallet to seat fully. The interference fit was secure without adhesive.
• On a “true” planed cedar 2x2 I milled to 2.00 inches, there was noticeable clearance (as expected). Again, silicone or a construction adhesive solved it.

If you’re expecting a friction-only press fit on a crisp 2.00-inch metal post, you’ll likely be disappointed. The 2.09-inch internal dimension intentionally leaves clearance for coatings and paint, and that means adhesive is the right approach for bare or uncoated posts. If your posts are slightly larger than 2 inches due to finish thickness, a mallet tap-in works well, but don’t force it—lightly sand or scrape the top edges or use adhesive instead of trying to deform the cap.

Installation experience

The process is straightforward and tool-light:

1. Dry-fit the cap to check how it sits.
2. If there’s play, run a thin bead of exterior silicone or polyurethane construction adhesive inside the skirt near the bottom edge. I avoid the corners so squeeze-out is minimal.
3. Seat the cap by hand and then use a rubber mallet to tap around the edges, alternating sides to keep it level.
4. Wipe any squeeze-out immediately with mineral spirits (for polyurethane) or a damp cloth (for silicone).
5. For metal posts in high-wind areas, I’ve also used 3M VHB tape in two strips inside the skirt instead of adhesive; it’s clean, instant, and strong.

Time per cap was under two minutes once I’d sorted the adhesive routine. One caution: the aluminum will deform if you hammer too aggressively with a hard mallet or metal hammer. A soft-face mallet is your friend, as is patience.

If you want a mechanical lock on metal posts, drilling and adding tiny stainless set screws through the skirt is an option, but not usually necessary with adhesive.

Weather protection and performance

Functionally, the pyramid sheds water well. After a heavy rain and several sprinkler cycles, the tops of the posts were bone dry under the caps, which is the main reason to use these on wood—keeping end grain sealed can dramatically extend service life. On metal posts, it’s about preventing water from sitting inside the tube and about a finished look. The caps stayed put through gusty days after the adhesive cured and didn’t buzz or click in wind.

Aluminum is a smart material choice outdoors. It won’t rust, and the powder coat resists UV better than rattle-can paint. I left one cap in full sun for a few weeks to watch for chalking or color shift—nothing obvious. Long-term, all powder coats will chalk a bit; a quick wash and a light coat of polymer car wax once a year will keep them looking fresh.

Aesthetics

The profile is crisp and understated. The pyramid shape works with both modern square-tube fencing and more traditional rail-and-picket layouts. The black finish blends well with most black hardware and hinges; it’s a touch glossier than some matte black gate kits, but not so glossy that it looks mismatched.

Alignment is easy: because the skirt is square and the apex is centered, you can visually square the cap to the post faces before final taps. The 0.63-inch skirt also creates a clean reveal that hides small top-edge flaws.

Durability and maintenance

• Material: Aluminum won’t corrode like steel if the coating gets scratched.
• Coating: The powder coat is tougher than paint but can scuff if you drop or scrape it along masonry. Touch-ups with a satin or semi-gloss black enamel blend acceptably if needed.
• Cleaning: Mild soap and water. Avoid harsh solvents that can haze powder coat.

After install, there’s virtually no maintenance beyond occasional wiping. If you use silicone, it’s flexible enough to handle thermal expansion without breaking the bond.

Value

Sold in a four-pack, these land in a nice middle ground: markedly more durable and better-looking than cheap plastic caps, and far more affordable and lighter-weight than cast iron caps. If you’ve got a whole fence line to outfit, sets like this make sense. I also like having a spare or two for future repairs or a gate addition.

Shortcomings to keep in mind

• Fit tolerance: The 2.09-inch internal dimension is correct for “true 2-inch” posts with coatings but will be loose on bare 2.00-inch posts without adhesive. Plan for adhesive if you want a secure install.
• Finish sheen: Expect a soft gloss rather than dead-matte black. If your hardware is ultra-matte, there’s a slight sheen mismatch.
• No included fasteners or adhesive: I don’t expect screws on aluminum caps, but a small tube of exterior adhesive in the box would help DIYers.
• Skirt height: At about 0.63 inches, it won’t cover tall weld beads or significantly out-of-square post cuts. Clean up the top of your posts for the best look.

Tips for a trouble-free install

• Measure your posts with a caliper if possible. Anything at or below 2.02 inches OD: plan on adhesive. Above ~2.05 inches: test press-fit with a mallet.
• Lightly break the sharp top edges of metal posts with a file; this helps the cap seat and protects the coating inside the skirt.
• Seal wood end grain first. A quick coat of exterior sealer under the cap is cheap insurance.
• For windy sites, use polyurethane adhesive or VHB tape rather than basic latex caulk.

Recommendation

I recommend these Pelopy caps for anyone outfitting true 2-inch square posts who’s comfortable securing them with adhesive when needed. The build quality is solid, the powder-coated aluminum looks clean and won’t rust, and the pyramid profile sheds water effectively. If you’re expecting a tight hammer-on fit on bare, exactly 2.00-inch posts with no adhesive, you may be frustrated by the designed-in clearance. Measure your posts, have a tube of exterior-grade silicone or polyurethane on hand, and these caps will give you a durable, finished look at a good value.