The 83251601 is a 4.8mm black glueless polyolefin heat shrink sleeve produced by Lapp Kabel. It has a shrink ratio of 2:1, meaning that if the sleeve is heated, the diameter will reduce to one-half of its original size. It features an adhesive-free construction and offers excellent chemical and abrasion resistance when applied. The sleeve is designed to provide an environmental seal to protect electrical components from dust, moisture, and other contaminants.