The 83251630 glueless heat shrink sleeve by Lapp Kabel is used to provide insulation and strain relief for terminations on electrical wires and cables. This product is a yellow polyolefin sleeve with a 2:1 shrink ratio and a 3.2mm diameter. It does not require an adhesive to keep it in place, and it is designed to shrink when exposed to heat, adhering tightly to the wire. Additionally, it provides a layer of protection against abrasion, vibration, and liquids.