Prime is defined as "of first importance," and Bar Fly's Prime mount CNC machined from 7075 aluminum, is the main mount - you can forget the rest. To accommodate the varying sizes of cycling computers, Bar Fly implemented dual mounting positions. This allows you to shift the mounting position and make extra space for taller, longer computers and allows you to move smaller computers inboard, tucking them closer to the handlebar. The aluminum construction provides the ultimate front camera mount. And there's a neat little mount on this mount just for a Di2/EPS junction box along the mount arm that further cleans up the cockpit and handlebars. Includes: BF4 Prime aluminum mount with position plate and hardware 7 Computer mount adapters: Garmin, Polar, Wahoo, Mio, Joule, Cateye, Bryton GoPro/Finned mount Light mount Di2/EPS mount Shim for 31.8 handlebars Specifications: Compatible Handlebars: 31.8mm & 35mm Compatible Computers: Garmin Edge: 200, 500, 510, 520, 800, 810, 820, 1000, 1030, & Touring, Garmin Watches: 910XT, 920XT Polar M450, M460, V650 Wahoo ELEMNT and BOLT Mio 500, 505, 505HC Cyclo 200, 205HC, 210, 315HC, 400, 405, 405HC, 505HC, 605HC Magellan 315, 505 Powertap Joule Cateye Wireless models Padrone, Strada, Micro, Velo Bryton 100, 300, 310, 330, 530, 10, One, 410 *Note: Computer can be used simultaneously with either a Di2/EPS mount, GoPro, or light (only 1 accessory can mount on bottom).