The base consists of a 1" diameter rubber ball, hardware for mounting to both brake/clutch reservoirs and rails that are 0.5" to 1.25" in diameter The mounting hardware for brake/clutch reservoirs include both standard and metric mounting bolts Multiple pivot points, rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles High quality materials insure your device is safe, secure, and within easy reach Fits 7/8" to 1-1/4" bars This mount is designed to hold the following devices: Garmin eTrex Legend, Garmin eTrex Summit, Garmin eTrex Venture, Garmin eTrex Vista