HellermannTyton Heat Shrink Tube, Black 76.2mm Sleeve Dia. x 30m Length 2:1 Ratio, TF21 Series, Shrunk Diameter: 38.1mm, Material: Polyolefin, Flame Retardant: Yes, Standards Met: CSA, JAR/FAR, NF F, SAE, UL Listed, UL Recognized, MPN: 309-17600 TF21-76.0/38.0-PO-X-BK