Features:1/4", 9/16", 5/16", 3/8", 7/16", 1/2", 9/16" 5/8" 4-point male pipe plug sockets in blow molded case.Transfers the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength.Allows up to 20% more torque to be applied than on standard hex impact sockets.The shift in pressure allows less socket wall thickness, increasing access to tight areas.Sockets grip the fastener across a broader CCContact area, reducing the chance of rounding off .On Oct-17-12 at 11:15:44 PDT, seller added the following inforMATtion:Every Buyerr gets a MyStoreRewards invitation for cash back