Picatinny rail mount for lights or lasers. Fits 7/8" diameter with included insert (most lasers) as well as 1" diameter for most lights.
Three screws, the middle screw holds the light/laser in the mount, the outer two screws hold the mount to the rail, so you can remove the light from the mount but leave the mount attached or remove the mount but leave the laser attached to the mount. 35mm long front to rea