Walthers Hex Wrench Set is a must-have tool that can be used as a socket or driver and makes quick work of loosening and tightening standard sizes of hex nuts and hex head screws (available from Walthers), as found on locomotives and other models. With sturdy metal construction, the set is complete with a handle and four interchangable heads to fit number 00, 0, 1 and 2 sized hardware