Check the listing for details. RAM-B-408-75-1U RAM Torque Medium Rail Base - B Size.... Color: Black, Condition: New. Listed at 36.94 USD. RAM Torque Medium Rail Base - B Size... RAM-B-408-75-1U Genuine RAM Products! The RAM Torque handlebar mounting base features a 1 INCHES B size RAM rubber ball and is compatible with rails 3/4" to 1" in diameter. Sizing inserts are included to provide a tight fit while also protecting the mounting surface. The RAM Torque mounting base also includes nylon-insert lock nuts to prevent loosening in high vibration environments.hardware included (2) #10-24 x 1 INCHES Socket Head Cap Screws(2) #10-24 Nylock Nuts(2) .75 INCHES Composite Bushings(2) .9 INCHES Composite Bushings(1) 88.9mm Rubber Strip(1) 5/32 INCHES Hex Key Wrenchclamp range .75 INCHES - 1 INCHES diameterball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.32 lb hardware included (2) #10-24 x 1 INCHES Socket Head Cap Screws(2) #10-24 Nylock Nuts(2) .75 INCHES Composite Bushings(2) .9 INCHES Composite Bushings(1) 88.9mm Rubber Strip(1) 5/32 INCHES Hex Key Wrench clamp range .75 INCHES - 1 INCHES diameter ball size B Size (1 INCHES ) weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lb materials Marine-grade aluminum packaging type Poly Bag Weight 0.32 lb