Specifications and models:

M2 * 17*46 white zinc (A3 ordinary not hard)

M2 * 17*46 black zinc (A3 ordinary not hard)

M2 * 17*46 White Nickel (A3 ordinary not hard)

M2 * 17*50 white zinc (A3 hardened)

M2 * 17*50 white nickel (A3 hardened)

M2.5 * 18*51 white zinc (A3 ordinary not hard)

M2.5 * 18*51 black (A3 ordinary not hard)

M2.5 * 18*51 White Nickel (A3 ordinary not hard)

M3 * 22*57 white zinc (A3 ordinary not hard)

M3 * 22*57 white nickel (A3 ordinary not hard)

M3 * 22*57 blackened (A3 ordinary not hard)

M4 * 23*64 white zinc (A3 ordinary not hard)

M4 * 23*64 White Nickel (A3 ordinary not hard)

M4 * 23*64 black (A3 ordinary not hard)

M5 * 25*68 white zinc (A3 ordinary not hard)

M5 * 25*68 White Nickel (A3 ordinary not hard)

M5 * 25*68 black (A3 ordinary not hard)

M6 * 30*83 white zinc (A3 ordinary not hard)

M6 * 30*83 black (A3 ordinary not hard)

M8 * 39*93 white zinc (A3 ordinary not hard)

M8 * 39*93 is black (A3 is not hard)

M4 * 22*60 white zinc (A3 plus hard)

M4 * 25*70 white zinc (A3 hardened)

M4 * 23*64 white zinc (A3 plus hard)

M4 * 23*64 black (A3 Hard)

M5 * 25*68 white zinc (A3 hardened)

M5 * 25*68 black (A3 Hard)

M6 * 30*83 white zinc (A3 hardened)

M6 * 30*83 blackened (A3 hardened)

M4 * 25*90 white zinc (45# steel hardened)

M5 * 30*94 white zinc (45# steel hardened)

M6 * 35*94 white zinc (45# steel hardened)

M5 * 35*100 White Zinc Hardening

M4 * 23*64 nickel hardened

M3 * 22*57 Nickel Hardening

M8 * 33*88 White Zinc Hardening

M10 * 45*99 White Zinc Hardening