Check the listing for details. RAM-B-273U RAM Add-A-Ball Accessory Ball for B Size Sock.... Color: Black, Condition: New. Listed at 22.44 USD. RAM Add-A-Ball Accessory Ball for B Size Sock... RAM-B-273U Genuine RAM Products! Connect another device to your existing RAM Mount with the RAM-B-273U Ball Base Adapter. This ball is made up of a 1 INCHES ball connecting to a 1/4 INCHES -20 threaded stud with a length of 1.6 INCHES . The threads on this ball replace the bolt in any B-size socket arm, and the ball connects to the middle of the socket arm on the opposite side of the tightening knob. If you are looking to mount more than one device but cannot locate multiple mounting points on your motorcycle or vehicle, this base is the ideal accessory for connecting both devices off of one mounting base.hardware included (1) 1/4 INCHES -20 x 2.25 INCHES Set Screwball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.08 lb hardware included (1) 1/4 INCHES -20 x 2.25 INCHES Set Screw 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 0.08 lb