EVERY COMPONENT OF THESE‚ LOCKING‚ CONNECTORS ARE BUILT TO OFFER THE LOWEST" STALLED COST AND MAXIMUM DURABILITY. QUICK-THREADED ASSEMBLY SCREWS" STALL FOUR TIMES FASTER THAN CMPETITIVE PRODUCTS AND BACKED-OUT SCREWS COME READY TO WIRE. RUGGED EASY-TO-GRIP NYLON HOUSING, CLEAR THERMOPLASTIC TERMINAL CHAMBERS AS WELL AS HIGH-STRENGTH BRASS ALLOY CONTACTS ARE ALL FEATURES OF THIS PREMIUM TURNLOK L1520C‚ 4-WIRE 20A 3-PHASE 250V CONNECTOR.‚