Spur Gear 1M 12T-60T Metal Transmission Gear 45# Steel 1 Modulus 12Teeth-60Teeth RM 13.02 to RM 48.32
1M20T Spur Pinion Gear 45# Steel Outer Diameter 22mm Bore 4/5/6/6.35/7/8/10/12mm RM 11.53 to RM 12.24