The Area 419 Improved Bipod Rail is 4.8a ^2 long with 10 slots. This gives you 43% more slots than the competition. No sharp edges. Every corner is radiused, and every edge is chamfered on the machine. Every slot is usable no matter where your mounting screws are. Made from 7075-T651 Aluminum for the greatest strength possible while maintaining its light weight. Comes with all related mounting hardware. Notes:Accommodates anywhere from 1.5a ^2 - 3.475a ^2 center on center screw hole spacing. If you are closer to the 1.5a ^2 spacing, do not use the flush cup mount for carrying the rifle, it will just have too much leverage and may tear the thread insert out of the stock.One full width lug to accommodate Larue style bipod mountsComes with (2) 10-32 x 3/4a ^2 Low profile socket head cap screws and (2) tee-nuts for installation in stocks with no hardware. A 3/4a ^2 paddle bit and drill press may be required for installation of tee-nuts.