The Milwaukee® SHOCKWAVE™ lineman's 7/16 in. hex to 1/2 in. square adapter is the most durable adapter on the market and it's pin detent allows for better retention to the socket. The adapter features an optimized Shockzone™ that absorbs peak torque and prevents the adapter from breaking, providing up to 30X life. The adapter is made from Custom Alloy76™ steel, which maximizes it's resistance to wear and shock. The 7/16 in. hex shanks allows the adapter to lock into all 7/16 in. quick connect chucks.