do they keep out water when used correctly?

I use them for insulating and bundling purposes. I have never tried an application either immersed underwater or exposed to moisture such as outdoors. I would definitely not try them in an immersion application. And I'd be cautious of exposing a shrink tube connection to a high humidity environment such as outdoors. Water tends to wick into tight places. I have extensive experience with shrink tubing. This is not a knock on this brand as I wouldn't count on any heat shrunk connection to be waterproof.

Are the inner diameters listed on the page before or after shrinking the tube?

Thank you for your interest in Pointool heat shrink tubing. The diameter dimensions shown on all product pages are the dimensions before heat shrinkage. And the shrinkage ratio of this heat shrink tube is 2:1. Hope this helps.

What r the sizes..duh??

Thank you for your interest in our heat shrink tubing. This heat shrink tubing kit includes 14 types of shrink sleeves with inner diameters of 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 5.5, 6, 8, 10, 13, 15 millimeter. Please check the video, you can find the English size corresponding to the inner diameter. All the tubes are neatly stored in a transparent box, and are equipped with a size classification map. Hope this helps. Any questions, please feel free to contact us, we will be glad to serve you.

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450 Pcs Heat Shrink Tubing Kit, 14 Sizes Black Heat Shrink Tube, Shrink Ratio Electric Heat Shrink

450 Pcs Heat Shrink Tubing Kit, 14 Sizes Black Heat Shrink Tube, Shrink Ratio Electric Heat Shrink

Product ID: 258501832

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Details

Brand
Pointool
Material
Polyolefin
Color
Black
Outside Diameter
0.52 Inches
Item Length
1.5 Inches
UPC
658437990236

📏14 precise sizes

🔥fast 10-second shrink

🗃️compact semi-modular case

Description

🔥 Shrink time, not your style – gear up like a pro!

DURABLE SECURE - Thick, high-quality material ensures a tight, lasting hold
QUICK EFFICIENT - Shrink tubes in just 10 seconds for rapid, professional results
CLUTTER FREE STORAGE - Semi-modular case keeps your workspace sleek and organized
VERSATILE SIZE RANGE - 14 perfectly measured sizes to fit every wire and cable need
DIY READY CONVENIENCE - Pre-cut tubes save time and hassle on every project

This 450-piece heat shrink tubing kit features 14 distinct sizes housed in a smart semi-modular case, designed for quick, secure wire insulation. Made from durable materials, the tubes shrink evenly within 10 seconds using a heat gun or lighter, making it an essential toolkit upgrade for DIY enthusiasts and professionals alike.

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