... Steel, Stainless steel, Aluminium, Brass 2. Size: M3 ~ M16 3. Head: Flat, Pan, Double Flat...etc4. Length: 16 ~ 400mm.5. Finish ... : Plain, zinc plated, galvanized, nickel plated. Black 6. Standard model: DIN, GB, ISO, ANSI, ASME, JIB etc.7. Pozi #2 ...