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