Check the listing for details. RAM-235-1U RAM Double U-Bolt Ball Base for 1.25" - 1.5" .... Color: Black, Condition: New. Listed at 38.44 USD. RAM Double U-Bolt Ball Base for 1.25" - 1.5" ... RAM-235-1U Genuine RAM Products! The RAM-235-1U consists of a double u-bolt base with 1.5 INCHES diameter ball and two zinc-coated u-bolts. The double u-bolt base will accommodate rails from 1.25 INCHES to 1.5 INCHES in diameter.hardware included (2) 1/4 INCHES -20 U-Bolts for 1.25 INCHES - 1.5 INCHES Rails(4) 1/4 INCHES -20 Nylock Nuts(4) Rubber Capsclamp range 1.25 INCHES - 1.5 INCHES diameterball size C Size (1.5 INCHES )weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbsmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.54 lb hardware included (2) 1/4 INCHES -20 U-Bolts for 1.25 INCHES - 1.5 INCHES Rails(4) 1/4 INCHES -20 Nylock Nuts(4) Rubber Caps clamp range 1.25 INCHES - 1.5 INCHES diameter ball size C Size (1.5 INCHES ) weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbs materials Marine-grade aluminum packaging type Poly Bag Weight 0.54 lb