Black alloy 10-15mm dove to 20mm weaver adaptor will raise the scope and will fit any general sporting rifle with a dovetail eg. JW15, 10/22. #4; rail 125mm long, 13mm high, 20.7mm wide weaver rail. (ideal for bolt action rifles left and right handed to give bolt lift and shell ejection clearance, but fits any rifle with dovetail) I have 222 Loctite listed and its recommended to use on the screws.