3M Heat Shrink Heatshrink + adhesive 620757 - 3M MDT-A32/7.5-B, The 3M MDT-A32/7.5-B heatshrink is a black, adhesive-lined tubing that offers a 4:1 shrinkage ratio, ideal for reliable insulation and protection. This product is 32 mm in diameter with a length of 1 metre, designed for sealing and mechanical support. It's commonly used in electrical applications to insulate cables and wires against moisture and environmental factors. 3M MDT-A32/7.5-B Heatshrink Tube Black 32mm 4:1 Shrink Adhesive 1m