Feature 1DURABLE MATERIAL: The clutch is made of good quality steel material, plus 36T nylon gear, which is durable and practical 2PERFECT REPLACEMENT: Kit includes 3pcs 36T nylon gear with bearing and 88mm clutch to replacement for Bafang motor metal solid gear 3USED FOR 500W-750W MOTOR: Electric bicycle accessories gear kit is suitable for 500W-750W motor, mostly used for electric bicycle for Bafang middle drive motor transmission motor spare parts 4HIGH STRENGTH AND GOOD TOUGHNESS: Motor gear clutch kit possess high mechanical strength, good toughness, and high reliability 5EXCELLENT PERFORMANCE: Motor gear clutch kit come with stable structure, excellent performance and long service lifeItem Type: E Bike Motor Gear Clutch KitMaterial: Steel + nylonNylon Tooth Belt Size: Outer Diameter: Approx. 47.5mm / 1.87in, Inner Diameter: Approx. 8mm / 0.31in, Thickness: Approx. 13.5mm / 0.53inClutch Size: Outer Diameter: Approx. 88mm / 3.46in, Inner Diameter: Approx. 15mm / 0.59in(manual measurement allowable error)Nylon Gear: 36TApplicable Motor: 500W-750W .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x E Bike Motor Gear Clutch KitNotePay attention to the size of the motor.