Check the listing for details. RAM-B-103-238CHU RAM Chrome Double Socket Arm with Diamond Pla.... Color: Black, Condition: New. Listed at 89.94 USD. RAM Chrome Double Socket Arm with Diamond Pla... RAM-B-103-238CHU Genuine RAM Products! The RAM-B-103-238CHU consists of a CHROME diamond base and double socket arm that will accept 1 INCHES ball bases. The diamond base measures 2.43 INCHES x 1.31 INCHES and contain two holes 1.912 INCHES from center to center, positioned at both ends of the diamond base. The hole pattern found on the diamond base will connect to many RAM cradles, as well as third party cradles including mounts with the industry standard AMPS hole pattern.socket to socket length 3 INCHES hole pattern 2-Hole AMPS: 1.912 INCHES ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.38 lb socket to socket length 3 INCHES hole pattern 2-Hole AMPS: 1.912 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 0.38 lb