Features1Product Material: The clutch is made of high quality steel, plus nylon 36T gear, which is durable, practical, and has long service life. 2Applicable Model: 3 pieces 36T nylon gear with bearing and one 70mm clutch kit is suitable for Bafang motor metal solid gear. 3Applicable Motor: Electric bicycle accessories gear kits are suitable for 250W, 350W motors. Mostly used for electric bicycle mid drive motor drive motor spare parts. 4Gear and Clutch Size: Gear outer diameter is 38mm/1.5in, gear inner diameter is 8mm/0.3in, gear thickness is 10mm/0.4in. Clutch outer diameter is 70mm/2.8in, clutch inner diameter is 15mm/0.6in. 5Good Workmanship: Exquisite workmanship and beautiful appearance design, providing you great using experience.SpecificationItem Type: GearClutchKitMaterial: Steel + NylonColor: As Pictures ShownWeight: Approx. 369g / 13.0ozNylon Gear Size: Outer Diameter: Approx. 38mm / 1.5inInner Diameter: Approx. 8mm / 0.3inThickness: Approx. 10mm / 0.4inClutch Size: Outer Diameter: Approx. 70mm / 2.8inInner Diameter: Approx. 15mm / 0.6inNylon Gear: 36TApplicable Motor: 250W, 350WPackage List1 x Gear Clutch Kit