Proto Torqueplus Deep Impact Sockets , 3/4 in Drive, 1 5/16 in Opening, 6 Points (577-07521L) EachChamfered service ends Large clearance holes Concentric openings Applies up to 15% more torque to fastener Reduces risk of fastener rounding 2 holes and groove accept retaining ring and pin, when securing to power tool Optimized socket wall thickness Drive Size = 3 4 in No. of Points = 6 Drive Type = Square Opening Size = 1 5 16 in Tip Bit Tip Type = Box Shank Socket Head Width = 2 1 8 in (opening side), 1 3 4 in (drive side) Overall Length = 3 1 4 in