... screw1.Head type:Flat Pozi ,Flat Hex Socket.2.Standard: ANSI, ISO, DIN, BS, JIS, AS 3.Material: Low carbon steel(C1008, C1010, C1012 ... plated, Cr+3, hot dip galvanized, brass plated.Sizes: Hex socket: 1) Deep hole: 7 x 50 2) Shallow hole: 7 ... x 40 4) Shallow hole: 5 x 40 MaterialsCrbon Steel/Stainless Steel/Brass ,According your requestSurfacePhos,Zinc,Yellow Zinc,Dacromet,Ruspert,Brass ...