Chicago Screws, 10/4 mm, black nickel, 5pcs

Screw for the manifacture of belts, collars and leashes. Size: A-3 mm. B-4 mm. C 10 mm. S 4 mm. Steel black nickel. How to chose the correct screw length?
Whether we work with leather, webbing, or any other material, its thickness is always the deciding factor. The proper size of a Chicago screw is when the length of a screw nut (value B in the table) is 2 mm less the total thickness of a material that's being connected.