For piggyback mounting of red dot sights as a secondary sighting system directly to your rifle scope tube Allows for fast transition between your rifle scope and a 1x power red dot optic for use at closer ranges Available in three styles: Compatible with Aimpoint Micro T1/T2 standard footprint, Docter standard footprint, RMR standard footprint 30 mm ring mount compatible with 30 mm scope tubes, installing via two set screws and included hex key All Monstrum mount and accessory products are backed by a lifetime guarantee ASIN#: B0CP4PKXRD