The RAM® Torque™ handlebar and rail mounting base has a 1" rubber ball and accommodates bars 1-1/8" to 1-1/2" or 0.75" to 1" in diameter. Sizing inserts are included to provide a snug fit and protection of the rail. The mount utilizes nylon-insert locknuts to prevent loosening in high vibration environments. Accommodates rails 1-1/8" to 1-1/2" or 0.75" to 1" in diameter. Powder-coated marine-grade aluminum. B size 1" rubber ball.