Impact Socket, Socket Size 13 mm, Socket Shape 6-Point, Drive Type Impact, Drive Size 1/4 in, Compatible Fastener Type Bolts, No, Alloy Steel, Black Oxide, Impact Rated Yes, Socket Depth Standard, Socket Length 1 31/32 in This 1/4" Drive Metric Impact Socket is designed to withstand high impacting torque loads, and is heat treated to a lower hardness than hand or power sockets to ensure durability for impact applications.