DHOOZ 900 Pcs Wire Heat Shrink Tubing Kit, Industrial Heat-Shrink Tubing for Wires, 2:1 Marine Grade Heat Shrink Wrap, Premium Large Electrical Waterproof Heat Shrink Tape,12 Sizes 6Colored Assorted, DHOOZ

Why this kit earns a spot in my wiring drawer

I keep a small stash of heat-shrink near my soldering station and another in the truck. The DHOOZ heat‑shrink kit has been living in both places for the last month, and it’s the one I’ve reached for most often. It’s not flashy, and it doesn’t pretend to be something it’s not. What you get is a broad, workmanlike assortment of polyolefin tubes that shrink predictably, hold up to heat, and cover most day‑to‑day electrical jobs without fuss.

What’s in the box

You’re looking at 900 pieces of 2:1 polyolefin tubing, all cut to 45 mm lengths, spread across 12 diameters and six colors, in a compartmented plastic organizer. The size range runs from very fine (around 1.0 mm before shrink) up to about 13 mm, which covers everything from single conductors and sensor leads through small cable bundles, barrel connectors, and modest USB/audio cable jackets.

A few practical notes from use:
- The distribution leans heavily toward the smallest sizes. That’s handy if you do a lot of PCB work or need lead identification, but you’ll burn through the mid‑range sizes (2.0–5.0 mm) first if you’re repairing harnesses and pigtails.
- Every piece is the same length. For straight splices and strain relief on small connectors, 45 mm is perfect. For thicker junctions or longer boots, plan on overlapping two pieces or augmenting with your own longer stock.

Shrink performance and material quality

This kit uses standard single‑wall polyolefin with a 2:1 shrink ratio. In practice, that means a 6 mm sleeve will reliably shrink down around 3 mm. Using a variable‑temperature heat gun, I get:
- Even, concentric shrink without fish‑mouthing at the ends
- No bubbling or piping on soldered joints (as long as I let the solder cool for a few seconds before shrinking)
- A matte finish that’s not brittle and resists fingernail gouges

There’s no adhesive lining. That’s important to understand. Without an internal meltable glue, you’re getting mechanical protection, abrasion resistance, and basic environmental shielding, but you’re not achieving a hermetic seal on its own. For splash‑resistant or indoor harness work, it’s perfectly adequate. For wet‑bilge, buried splices, or under‑hood connections exposed to pressure washing, this should be layered over adhesive‑lined heat shrink or used with a proper sealed connector. The “marine grade” label on the box doesn’t change the physics.

Heat tolerance is right where I expect a good polyolefin to be. I can walk a hot‑air nozzle across the full set of diameters without scorching at typical electronics temps. A cigarette lighter will work in a pinch—just keep it moving to avoid soot and localized melting. A hair dryer is usually too weak for the larger diameters.

In the field: repairs and small projects

A few representative jobs I ran through this kit:
- Headphone and headset cable reinforcement: 3–4 mm sizes sit nicely over 3.5 mm plugs and molded strain reliefs. Two stacked pieces add a little stiffness without making the plug bulky.
- Sensor lead splices: For 22–24 AWG, the 2.0–3.0 mm pieces clamp down cleanly over a soldered Western Union splice. I stagger splices on multi‑conductor cables and shrink each individually, then finish with a larger outer sleeve for abrasion resistance.
- Automotive pigtail repairs: On 16–18 AWG, the 4–5 mm sizes are my workhorses. They shrink snug around the insulation and hold up under gentle heat from a cordless gun—no glossing or split ends.
- Labeling and color coding: The six colors aren’t standardized to sizes in any industry sense, but they’re handy for marking polarity or channel IDs. They also help visually confirm you didn’t miss a joint in a bundle.

Across these, what stood out was consistency. I didn’t hit oddball tubes that refused to shrink, and nothing split under normal use. The smallest diameters are truly small—great for single leads and component protection, not for jumping over even tiny connectors. The largest pieces will sleeve a slim USB cable but won’t swallow a bulky inline splice without stepping up to adhesive‑lined 3:1.

Organization and usability

The organizer is a basic flip‑lid box with individual compartments. It’s not shop‑proof, but it’s kept the assortment tidy in my bag. I wish the size labels were printed inside each compartment; as with most kits, I end up eyeballing or test‑fitting. If you rely on specific diameters frequently, a quick cheat sheet taped inside the lid is worth five minutes.

Pulling pieces is easy, and the cut ends are clean—no ragged edges or fused pairs that waste time. Because all lengths are 45 mm, you don’t need to think much before grabbing—if the diameter fits, the length will usually be serviceable.

Where 2:1 shines—and where it doesn’t

A 2:1 kit is a generalist’s friend. It:
- Covers most electronics and light automotive work
- Slides over heat‑sensitive components without needing extreme heat to finish the shrink
- Plays well with staggered splicing and layered protection

But there are limits. If you need to sleeve over a connector housing or a butt splice and still achieve a tight grip on the insulation, 3:1 or 4:1 adhesive‑lined tubing is the right tool. Similarly, if you need long boot‑style strain reliefs, the 45 mm length means you’ll be doubling up or sourcing longer sticks.

Tips for getting the most from this kit

• Choose diameter based on your largest obstruction. With 2:1, the final fit will be roughly half the starting size; plan your splice profile accordingly.
• For “waterproofing,” layer: individual conductors first, a dab of non‑corrosive RTV if needed, then an outer piece. For true environmental seals, switch to adhesive‑lined sleeves.
• Let solder joints cool before shrinking to avoid air expansion that can balloon the tube.
• When reinforcing cable exits, slightly stretch a piece before shrinking to create a tapered boot effect, then finish with a second un‑stretched piece for durability.

Value and assortment balance

As a bulk kit, this represents good value for bench stock. The generous count of small sizes is fantastic for electronics and lead insulation, but if your work skews toward 14–18 AWG splices and small cable jackets, you’ll deplete the mid‑sizes quickly and end up with a surplus of tiny and jumbo pieces. That’s not a flaw—just the nature of “one box for everything.” I’d pair this assortment with a small refill set of your most‑used diameters or a separate adhesive‑lined 3:1 kit for sealed jobs.

The bottom line

The DHOOZ heat‑shrink kit does exactly what I want from a general‑purpose assortment: consistent shrink, decent abrasion resistance, and enough sizes and colors to handle quick repairs, tidy up harnesses, and add strain relief to everyday cables. There’s no adhesive lining, and despite the “marine” phrasing on the packaging, it shouldn’t be your first choice for submerged or high‑pressure environments. The fixed 45 mm length is practical nine times out of ten, and easy to work around the tenth.

Would I recommend it? Yes. If you need an affordable, reliable stock of 2:1 polyolefin tubing for electronics, hobby projects, automotive interiors, and general shop use, this kit is a strong pick. Add an adhesive‑lined, higher‑ratio set for sealed applications and a small refill of your most‑used diameters, and you’ll have a two‑box system that covers nearly every scenario without overcomplicating your workflow.