... , brass, copper, alloyFinishPlating, Oxiding, Blasting, Painting, Anodizing, Heat treatment, AlodineTolerancehexagon socket screws: +0.0004/-0, +0/-0.0004 inchStandard DIN912,913 ... , Length : 2MM - 50MM It is usually used to fasten components with round axles.Size list:Hexagon Wrenches(Hexagon Key) DIN911Material; CRV6150Hardness: HRC48 ...