RAM Mount RAM-B-408-112-15U Torque™ Large Rail BaseThe large version of the RAM Torque handlebar mounting base features a 1" B size RAM rubber ball and is compatible with rails 1 1 8 to 1 1 2" in diameter. Sizing inserts are included to provide a tight fit while also protecting the mounting surface. The large RAM Torque mounting base also includes nylon insert locknuts to prevent loosening in high vibration environments. HARDWARE INCLUDED (2) #10 24 x 1" Socket Head Cap Screws(2) #10 24 Nylock Nuts(2)