Gamo 621316954 Extra High Deluxe Scope Mounting Rings, 1-inch Fits Standard dovetail Aluminum 1 inch rings for 3/8 inch rail or 22 rail Able to mount scopes with objective diameter up to 57 mm Aluminum 1" inch rings for 3/8" rail or .22 rail. Able to mount scopes with objective diameter up to 57mm.