"Opti-Torque system applies torque to the fastener sides reducing corner round off","150° chamfer on the socket drive end for better grab, constant pressure and easier use","Easy-read, high-visibility size markings","Sizes include: 10mm - 19mm","Set comes on a socket rail 10 PIECE 3/8" DRIVE METRIC 6 POINT ADV UNIVERSAL IMPACT SOCKET SET SBUPM106V | Matco Tools