Specification: Name: Chainwheel Protector Material: High Strength Plastic Size: 40T, 42T, 44T, 46T, 48T, 52T Package: 1x Chainwheel Protector, 5x Screws The chainwheel cover helps prevent clothing from getting caught in the chainring during riding. It provides protection against oil and damage. The product comes in various sizes and is suitable for most mountain bikes, city bikes, and folding bikes. Made of durable plastic material. Friendly Reminder: Before purchasing the chainwheel cover, please accurately measure the center-to-center distance between mounting holes and count the number of teeth on your chainring. Choose the correct model based on your measurements to ensure proper fit. Incorrect measurements may result in improper installation. Purchase Guide: Measure the center distance between two adjacent mounting holes and count the number of teeth on the chainring. Select the corresponding model accordingly. Common Chainring Specifications: - 42T, 4-hole, center distance: 10cm - 42T, 4-hole, center distance: 10.5cm - 44T, 4-hole, center distance: 10.5cm - 44T, 4-hole, center distance: 11cm - 48T, 4-hole, center distance: 12cm - 48T, 5-hole, center distance: 10cm - 48T, 5-hole, center distance: 9.5cm - 52T, 5-hole, center distance: 10.5cm How to Choose the Correct Protector: 1. Count the number of teeth on the chainring. 2. Confirm the number of mounting holes. 3. Measure the center-to-center distance between the holes. If you are unable to identify the correct chainwheel protector, please contact the seller for assistance.