Mizugiwa 1 Inch Scope Mount Rings Medium Profile for 11mm Dovetail Rails 2-Piece 1 Inch Medium Profile Dovetail Scope Mount Rings Precision Machined from Aluminum Alloy with Anodized Black Matte Finish One of the rings has a stop pin the bottom of it for rock solid application With four screws design, it will hold the scope more securly than a single screw on both side Scope Rings Type: Medium Profile (14mm),Fit for a .22 rifle or an air rifle using a 3/8" or 11mm dovetail mount