Standard M1913 Picatinny rail configuration – Anodized flat black aluminum – Mounting does not require alteration of AR Handguard heat shields – Includes socket head mounting screws with special flat nuts for an unobrusive mount – Includes ERGO LowPro Rail Covers – Overall Length: 4.155 inches – 10 Slots – Will fit Savage 338 Lapua 110BA stock – 1.100 – 2.100 Inch Hole Spacing