we are manufacturer of Motorcycle Spare Parts, accessories, Auto Spare Parts, Car Spare Parts Wholesale, Wheel bolt, Bullet Wheel Bolt Wholesale, wheel Bolt Suppliers, High tension Wheel Bolt. conical seat auto chrome M12x1.5 wheel lug bolt 1) salt spray test: more than 72 hours 2) plating: 4 layers nickle+1 layer chrome,our thickness of nickle ≥28μm 3) warranty: 1 year 4) testing: 100% from product to packing 5) finish: chrome,zinc,blacking,dacromet,color electrophoretic and mucn more 6) grade: 6/8/10 7) black chrome