Specification Binding : Misc. Brand : Sk Professional Tools Label : SK PROFESSIONAL TOOLS Manufacturer : SK PROFESSIONAL TOOLS MaterialType : Alloy Steel NumberOfItems : 1 PartNumber : 40321 ProductGroup : BISS Basic ProductTypeName : FASTENER_DRIVE_BIT Publisher : SK PROFESSIONAL TOOLS Size : One Size SmallImage_Height : 75 SmallImage_URL : https://m.media-amazon.com/images/I/413CWmh4-xL._SL75_.jpg SmallImage_Width : 75 Studio : SK PROFESSIONAL TOOLS Title : Socket, 1/2 in. Dr, 21mm, 12 Pt.