Product Name: 0.3M Reduction Metal Copper Gear Plastic PinionMaterial: Plastic/CopperModulus: 0.3Gear Diameter = (Number of Teeth + 2) x Modulus71A: 7 Teeth, Bore 0.95mm, Brass Gear (fits motor shaft of 1mm diameter), Diameter 3mm702A: 70 Teeth, Bore 1.95mm, Plastic Gear (fits motor shaft of 2mm diameter), Diameter 21.6mm701A: 70 Teeth, Bore 0.95mm, Plastic Gear (fits motor shaft of 1mm diameter), Diameter 21.6mmInstallation Tips:(1) When putting in this pinion, be sure you press the rear disguise of the hollow cup motor to avoid accidents the place the motor conceal is jacked out by means of the shaft; since the hole is small, there's a option that an excessive amount of force could cause the gear to fly out, so ensure you find an open and clear position with little debris for installation, so that although the gear flies, it may be retrieved.(2) When putting in the copper equipment (tight-fitting type), you could possibly gently faucet the back cover of the motor whereas keeping it opposed to the again cover.Pack Quantity: 1Pcs