Yeah, it's the difference between flattened and round. If you want to think of it this way, one is the circumference and the other is the diameter. I have the HK shrink tube, too, and have no issues with it. Good quality for the price.
Howdy. Will this shrink-wrap the Turnigy AE-20A Brushless ESC (see link) which measures 50mm (L) x 26mm (W) x 12mm (H).
http://www.hobbyking.com/hobbyking/store/uh_vi ewItem.asp?idProduct=11615&Product_Name=Turnigy_AE-2 0A_Brushless_ESC
Just check the width... 30mm is after shrinking. Probably when you buy it, it will be more than 50mm in size (diameter). It will shrink max to 30mm after applying heat. your ESC looks small for this. Maybe you can try the 14 mm one. here it is. www.link
*Saurabh, I'm pretty sure it's not. with all of the heatshrink I've bought from HK it's noted diameter was unshrunk :P 6mm was 6mm, 5mm was 5mm, and 4mm was 4mm. May be different for certain kinds of shrink on the site.
DO NOT BE CONFUSED. THIS DIAMETER IS BEFORE SHRINKING.
Saurabh is confusing flat width with diameter.
When expanded to a circle, this will be 30mm in diameter.
In response to OP, this heatshrink is NOT suitable, you need to use the 50mm heatshrink.
Yes Starry, this 30mm HeatShrink WILL FIT around your AE-20A BESC. I promise you.
This Turnigy30mm HeatShrink is actually 50mm! (no idea why). The maximum size an obect can be in order to fit is about 34mm(W)x16mm(H). Length of mine was 1015mm so just cut that to 50mm(L), slide in your AE-20A BESC, add some heat and you are good to go, bro :)