Constructed from a high quality proprietary polymer blend that is super durable Securely locks and perfectly positions your computer Fits 31.8, 25.4 & 22.2mm handlebars Simple onebolt design makes installation a breeze Compatible with Garmin Edge 20, 25, 130, 510, 520, 530, 810, 820, 830 & various other cycling computers Not compatible with Edge 1000 series