Check the listing for details. RAM-D-247U-4 RAM Square Post Clamp Base for Posts up to 4".... Color: Black, Condition: New. Listed at 68.94 USD. RAM Square Post Clamp Base for Posts up to 4"... RAM-D-247U-4 Genuine RAM Products! This square post mount is ideal for forklift mounting and consists of a 4 INCHES clamp base with a D size 2.25 INCHES ball. Attach any length D size socket arm, D size ball adapter and a device holder of your choosing for an ultra-rugged mounting solution for your forklift. While the base can support up to a maximum post width of 4 INCHES , it can support any lesser width by rotating the base on the post, bringing the mounting bolts flush against the post.hardware included (2) 5/16 INCHES -18 x 3 INCHES Machine Screws(2) 5/16 INCHES -18 Nylock Nutsclamp range 4 INCHES max widthball size D Size (2.25 INCHES )weight capacity Standard Use: 6 lbsHeavy-Duty Use: 5 lbsmaterials Marine-grade aluminumpackaging type Poly BagWeight 1.44 lb hardware included (2) 5/16 INCHES -18 x 3 INCHES Machine Screws(2) 5/16 INCHES -18 Nylock Nuts clamp range 4 INCHES max width ball size D Size (2.25 INCHES ) weight capacity Standard Use: 6 lbsHeavy-Duty Use: 5 lbs materials Marine-grade aluminum packaging type Poly Bag Weight 1.44 lb