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