... Non-standard flat washer with small holes 2.Size: M6-M20 3.Grade: SAE,USS,F436 4.Material:Carbon steel Specification of ... Black Oxided, Dacromet,Geomet,etc7.Production TechniqueStamping, Machining,etc8.Production Capacity60Tons/Month9.PackageBulk in carton, small ... Black Oxided, Dacromet,Geomet,etc6.Production TechniqueStamping, Machining,etc7.Production Capacity60Tons/Month8.PackageBulk in carton, ...