1. DURABLE MATERIAL: The clutch is made of steel material, plus 36T nylon gear, which is durable and practical 2. PERFECT REPLACEMENT: Kit includes 3pcs 36T nylon gear with bearing and 88mm clutch to replacement for motor metal gear 3. USED FOR 500W MOTOR: Electric bicycle accessories gear kit is suitable for 500W motor, mostly used for electric bicycle for middle drive motor transmission motor spare parts 4. HIGH STRENGTH AND GOOD TOUGHNESS: Motor gear clutch kit possess high mechanical strength, good toughness, and high reliability 5. EXCELLENT PERFORMANCE: Motor gear clutch kit come with stable structure, excellent performance and long service life Item Type:E Bike Motor Gear Clutch Kit Nylon Gear:36T Applicable Motor:500W Note:Pay attention to the size of the motor. Colour:As Shown Material:Plastic+Metal Size:Nylon Tooth Belt Size:Outer Diameter:.47.5mm/1.87in, Inner Diameter:. 8mm/0.31in, Thickness:.13.5mm/0.53in; Clutch Size:Outer Diameter:.88mm/3.46in, Inner Diameter:.15mm/0.59in Package Contents: 1 * Ebike Gear Clutch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.