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Tip: If you need a large amount, we are able to customise it. Calculation method of gear outer diameter: gear diameter = (number of teeth + 2) * modulus For example(0.25Modulus 10T): Gear diameter= (10+2)*0.25=3mm Product Description Inner hole: many elective Material: Brass Practical remote control aircraft, RC Car model, Gear Box etc Option: Gear Number: Modulus: Outer Diameter(Max): Thickness: Hole: Model 1 9T 0.25 2.75mm 3mm 0.98mm(fit 1mm shaft tightly) Model 2 10T 0.25 3mm 3mm 0.98mm(fit 1.tmm shaft tightly) Model 3 11T 0.25 3.25mm 3mm 0.98mm(fit 1mm shaft tightly) Model 4 12T 0.25 3.5mm 3mm 0.98mm(fit 1mm shaft tightly) Package Included: Gear * 5pcs