Is the diameter on each tube the original size (pre-shrinking)?

Yes.Size is before shrinking,3/32 shrinks to 0.8mm. 1/8 shrinks to 1.1mm. 3/16 shrinks to 1.6mm. 1/4 shrinks to 2.1mm. 3/8 shrinks to 3.2mm. 1/2 shrinks to 4.2mm. 3/4 shrinks to 6.0mm

Can this be used to join two tubes together? Does the glue just seal the ends or the entire tube?

If the tubes and the heat shrink tubes fit snugly after heating them I'm sure it would work well. This is very durable heat shrink, thicker than most. Keep in mind also, it's 3:1 shrink. Glue throughout the tubing.

What is the max temperature on these heat shrink tubes? Can I put it in the car engine bay?

Operating temperature: -55℃～125℃.They can be used in an engine bay.

Our heat shrink tubing kits are produced in China,but I can say after using these on a number of projects and boat rewiring they don't leak or seem to be affected by oil/gas/saltwater,and they've held up over time which is all that matters.

ASIN	B0BVVMCY86
Best Sellers Rank	#426 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Industrial Heat-Shrink Tubing
Date First Available	February 15, 2023
Item Weight	11.3 ounces
Item model number	HST-400
Manufacturer	Eventronic
Product Dimensions	0.39 x 0.39 x 0.39 inches

400 Pcs Heat Shrink Tubing Kit-3:1 Ratio Adhesive Lined,Marine Grade Shrink Wrap - Industrial Heat-Shrink Tubing - Black

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