The BOSTITCH BTMT72267 10pc Combo SAE Wrench Set features long panel design for added torque, and an anti -slip design that allows greater contact area against fastener. The convenient storage rack is great for permanent set containment, easy organization & tool protection. This set is made of high quality chrome vanadium verged body which allows for torque, strength & durability - and the Max-Drive design allows for 15% more torque and helps reduce for fastener rounding. (vs. standard combination wrenches).