The RAM slide-n-lock allows you to quickly connect your VESA Plate mounted monitor to your RAM Mounting system, and the LOCK it in place. The top plate has the universal 75mm and 100mm VESA hole pattern, while the bottom connection has an AMPS hole patten from connecting to any of the RAM 1.5″ dia Ball sized mounting systems. A RAM ball is not included with the purchase of this product. The recommended ball size system for Monitor mounting is the RAM-202 (1.5″ C Sized Ball) The „”U”” in the part number reflects product packaged in poly bag. For additional specifications, see components and drawings tabs.