Check the listing for details. RAM-273U RAM Ball Adapter with 2.5" Long 1/4"-20 Threa.... Color: Black, Condition: New. Listed at 29.44 USD. RAM Ball Adapter with 2.5" Long 1/4"-20 Threa... RAM-273U Genuine RAM Products! The RAM-273U consists of a C size 1.5 INCHES rubber ball with a hex post and 1/4 INCHES -20 x 1.75 INCHES stainless steel threaded stud. This component can mount to any surface with a 1/4 INCHES -20 hole, and the ball is compatible with any C size socket arms.hardware included (1) 1/4 INCHES -20 x 1.75 INCHES Threaded Studthread pitch 1/4 INCHES -20 x 1.75 INCHES ball size C Size (1.5 INCHES )weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbsmaterials Marine-grade aluminumStainless steelpackaging type Poly BagWeight 0.16 lb Additional Information This product is not considered a RAM Add-A-Ball and will not replace the bolt of a C size socket arm. hardware included (1) 1/4 INCHES -20 x 1.75 INCHES Threaded Stud thread pitch 1/4 INCHES -20 x 1.75 INCHES ball size C Size (1.5 INCHES ) weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbs materials Marine-grade aluminumStainless steel packaging type Poly Bag Weight 0.16 lb