Millet Angle Loc .22 Scope Rings, windage adjustable. They are matte/high and fit 3/8" dovetailed receivers. These are all steel. I had a 4-12x40 mounted on these and had about 1/4" space between the ojective bell and the barrel. I believe they will work with up to a 50mm. Like new. $15.00 TYD. Here is a link to them at Brownells.

http://www.brownells.com/aspx/ns/store/ProductDetail.aspx?p=9078&title=ANGLE-LOC?%20.22%20SCOPE%20RINGS