Check the listing for details. RAM-B-408-37-62U RAM Torque Small Rail Base.... Color: Black, Condition: New. Listed at 36.44 USD. RAM Torque Small Rail Base... RAM-B-408-37-62U Genuine RAM Products! The RAM Torque small rail base features a B size 1" rubber ball and accommodates rails from 3/8" to 5/8" in diameter. Sizing inserts are included to provide a snug fit and protection of the rail. The mount utilizes nylon-insert lock nuts to prevent loosening in high vibration environments. The RAM-B-408-37-62U allows for mounting to scooter mirror rails as well as vehicle headrests and other round rails within the stated dimensions.hardware included (2) #8-32 x .75 INCHES Socket Head Cap Screws(2) #8-32 Nylock Nuts(2) .32 INCHES Composite Bushings(2) .4 INCHES Composite Bushings(2) .47 INCHES Composite Bushings(2) .55 INCHES Composite Bushings(1) 57.2mm Rubber Strip(1) 9/64 INCHES Hex Key Wrenchclamp range .375 INCHES - .625 INCHES diameterball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.21 lb hardware included (2) #8-32 x .75 INCHES Socket Head Cap Screws(2) #8-32 Nylock Nuts(2) .32 INCHES Composite Bushings(2) .4 INCHES Composite Bushings(2) .47 INCHES Composite Bushings(2) .55 INCHES Composite Bushings(1) 57.2mm Rubber Strip(1) 9/64 INCHES Hex Key Wrench clamp range .375 INCHES - .625 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 0.21 lb