Product Description The Assorted Socket Screw Set includes both Hex Head Set Screws a.k.a. Hex Head Cap Screws and Socket Set Screws.Hex Head Set Screws sit on the surface with a thick head, providing ample bearing surface for tightening with a wrench or hex screw driver. This reduces the chance of stripping the screw head. Socket Set Screws are designed to secure an object against another object. They pass through one hole in the object and tightening against another object through another threaded hole at right angle.