"Opti-Torque system applies torque to the fastener sides reducing corner round off","150 degree chamfer on the socket drive end for better grab, constant pressure and easier use.","High Visibility size markings quickly identify socket","Sizes include: 1/4\" - 3/4\", 7mm-19mm, Universal Joint, 3\" Extension","Set comes in a blow-molded case 24 PIECE 3/8" DRIVE METRIC & SAE 6 POINT ADV MAGNETIC IMPACT SOCKET SET SBMP246V | Matco Tools