ERGO 5 Slot Aluminum Rail Mounting Platform configured to Standard M1913 Picatinny Standards. – 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 unobtrusive mount – Includes ERGO LowPro Rail Covers – Overall Length: 2.165 inches – 5 Slots – 0.7 Inch Hole Spacing