... ,Black,Teflon Coating(PTFE) Black, White,Blueness Zinc,Nickel Plating 3.MS,CS,SS Stud Bolts & Nuts Size 1/2"-2" Specification ... . Black ,Teflon Coating (PTFE) Black, White or Blueness Zinc (Cr.3 or Cr.6), Dacromet, Hot Dip Galv, Nickel Plating .Packing ...