... :hex nut Size:M3-M64 Surface:plain,zp,balck,HDG Package:bulk and box 1) Different kinds of nuts ... -forging.2) Different finish, such as bright, zinc plated, yellow zinc plated3) Can be made as low carbon steel ... M Grade4,5,6,8,9,10FinishBlack, Zinc Plated, Galvanized, HDG, Nickel Plated, Chrome PlatedDelivery timeUsually within 25-30 days ... your requirement.Productivity600 tons per years zinc plated hex