Check the listing for details. RAM-B-238U RAM Diamond Ball Base - B Size.... Color: Black, Condition: New. Listed at 20.44 USD. RAM Diamond Ball Base - B Size... RAM-B-238U Genuine RAM Products! The RAM-B-238U ball base consists of a 1 INCHES B size rubber ball connected to a 2.43 INCHES x 1.31 INCHES diamond plate. The diamond plate features two holes that measure 1.912 INCHES from center to center, matching the industry-standard AMPS hole pattern. This diamond ball base is compatible with a wide variety of RAM device holders and cradles.hole pattern 2-Hole AMPS: 1.912 INCHES plate size 2.43 INCHES x 1.31 INCHES ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.1 lb FEATURES Diamond plate features industry-standard AMPS hole pattern and measures 2.43 INCHES x 1.31 INCHES Compatible with several RAM device holders and cradles; ball and socket technology allows for near-infinite adjustability Made of powder-coated, marine-grade aluminum for durability and reliability in the most demanding environments Backed by a lifetime warranty hole pattern 2-Hole AMPS: 1.912 INCHES plate size 2.43 INCHES x 1.31 INCHES 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 0.1 lb