Cable Gland, Skintop ST, IP68, PG21, 13 mm, 18 mm, Nylon (Polyamide), Grey. The SKINTOP ST series from Lapp Kable are cable glands constructed from tough polyamide and offer many advantages over conventional brass glands. They are now used in substantial volumes on panels, switches, control equipment and machine tool industry. Temperature range from -20°C to 80°C