GEARWRENCH 85999 13-piece XL Gear Box Double Box End metric ratcheting wrench set consists of 1 of each 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16" 7/8", 15/16 and 1" XL gear box ratcheting wrenches. Ratcheting box end need as little as 5-Degrees to move the fastener as opposed to 30 degrees for standard box end wrenches. The standard box end combined with the long pattern length gives this wrench excellent torque capabilities to break a stubborn, rusted fastener. The ratcheting box end then makes the loosening or tightening of the fastener fast and safe. The box end features improved box end strength from GEARWRENCH's Off-Corner Loading and at the same time, reduces fastener rounding. The double box end ratcheting wrenches are made from the finest chrome vanadium steel for precision long lasting tool life.