The ratcheting box end needs as little as 5 degrees to move the fastener. It's 15 degree offset provides additional knuckle clearance. Surface drive nearly eliminates rounding of the fastener. GrearWrench products are warranted for life to be free of defects in material and workmanship This SAE wrench set is unique for its ability to reverse. It uses a reversing lever which eliminates the need to remove the wrench from the fastener to change direction It's simple and easy to use. Set includes sizes: 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".