Product Name: 0.3M Reduction Metal Copper Gear Plastic Pinion Material: Plastic/Copper Modulus: 0.3 Gear Diameter = (Number of Teeth + 2) x Modulus 71A: 7 Teeth, Bore 0.95mm, Brass Gear (fits motor shaft of 1mm diameter), Diameter 3mm 702A: 70 Teeth, Bore 1.95mm, Plastic Gear (fits motor shaft of 2mm diameter), Diameter 21.6mm 701A: 70 Teeth, Bore 0.95mm, Plastic Gear (fits motor shaft of 1mm diameter), Diameter 21.6mm Installation Tips: (1) When installing this pinion, be sure you press the rear disguise of the hollow cup motor to circumvent injuries the place the motor disguise is jacked out by means of the shaft; since the gap is small, there is a option that an excessive amount of force could cause the equipment to fly out, so be sure you discover an open and clean position with little debris for installation, in order that even though the equipment flies, it can be retrieved. (2) When putting in the copper tools (tight-fitting type), you possibly can gently faucet the back disguise of the motor whereas retaining it against the back cover. Pack Quantity: 1Pcs