minus screw 1.high cost performance 2.size of minus screw:M3-M64 ,1/8-3' 3.various surface treatment 4.rohs iso approve minus screw1.various kinds of minus screw available.2.high quality competive price .3.material of the minus screw:stainless steel ,carbon steel,copper and so on4.surface treatment:Passivation,Chromium-Plating,Black, Zinc-Plating or according require5.can be made with different ...