The Milwaukee Shockwave(tm) Lineman's 7/16" Hex to 1/2" 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(tm) that absorbs peak torque and prevents the adapter from breaking, providing up to 30X life. The adapter is made from Custom Alloy76(tm) Steel, which maximizes it's resistance to wear and shock. The 7/16" hex shanks allows the adapter to lock into all 7/16" quick connect chucks.