1)Hexagon slotted and castle nut 2)Size:M4-M20 3)Material:Steel,SS,Brass... 4)Surface:plain,zinc plated,HDG,black... Hexagon slotted and castle nut1.material: SS316, SS304,wild steel, iddle carbon steel2.size: M4-M203pallet: small size in polly bags or paper boxes,large size in cartons Hexagon slotted and castle nuts