These 3-Hole 3/4″ Skinned strain reliefs provide a waterproof entrance or exit for wiring on PV module junction boxes and outdoor combiner boxes. The holes are 7.7mm ideally sized for PV-Wire and other commonly used cables. The skinned cord grips feature a break-thru skin over the glands providing a liquid tight seal around the wires and unused holes. The skin protects the unused holes from dust and water, allowing you to use only the number of cable holes you need. These strain reliefs are made of Nylon with Buna-N seals. Resistant to salt water, weak acids, weak alkalis, alcohol, ether, esters, ketones, and mineral, animal and vegetable oils. Non-corrosive, suitable for direct burial installations. UL Listed and suitable for use in NEMA 4, 6 and 12 applications. Metal locknut included.