This quick detach (QD) rail mount offers both windage and elevation adjustment and a lock function to secure your particular settings. It will fit both a 30mm and 1-inch tube (with supplied spacer). This QD mount is very popular for use with the Night Master 800-IR and 400-IR infrared illuminators on the Pulsar N550/ N750 and Yukon Photon night vision devices as they allow the user to adjust the beam for their shooting distance. It is suitable for rifles/ guns and nightvision devices with rails. It can also be used in conjunction with the scope ring with rail for mounting a torch onto a 1-inch or 30mm scope.