This Universal rail is 6.13 inches long and is machined from solid aluminum, then black anodized. Professional design let you clamp to any standard 3/8 dovetail. It accepts any quality accessory that requires a 'Weaver', 'Picatinny', or '7/8' mount.  Securely installs with a Phillips medium (#1 size) screw driver to provide a rigid accessory mount.