"Opti-Torque system applies torque to the fastener sides, reducing corner round off","150º chamfer on the socket drive end for better grab, constant pressure and easier use","High-visibility size markings quickly identify socket","Includes sizes: 1/4\" - 9/16\"","Set comes on a socket rail 6 PIECE 1/4" DRIVE SAE 6 POINT ADV UNIVERSAL IMPACT SOCKET SET SAUP66V | Matco Tools