Check the listing for details. RAM-B-185U RAM Double Ball Mount with Diamond Plate & 1/.... Color: Black, Condition: New. Listed at 42.44 USD. RAM Double Ball Mount with Diamond Plate & 1/... RAM-B-185U Genuine RAM Products! The RAM-B-185U consists of our medium length B-size arm with our 2.43 INCHES x 1.31 INCHES Diamond Ball Base and 1/4 INCHES -20 Female Threaded Postsocket to socket length 3 INCHES hole pattern 2-Hole AMPS: 1.912 INCHES thread pitch 1/4 INCHES -20 x 5/8 INCHES (female)ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.45 lb socket to socket length 3 INCHES hole pattern 2-Hole AMPS: 1.912 INCHES thread pitch 1/4 INCHES -20 x 5/8 INCHES (female) 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 0.45 lb