NcStar Hunter Series, 3/8" dovetail 1" rings. Features: - scope rings fit 1" tube scopes. - mounts onto 3/8" dovetail rails. - hexagon shape mounting nut, with holes for torquing with allen key wrench. Specifications: - optic centerline height: 0.90" - ring overall height: 1.90" - weight: 1.70 oz - finish: black anodized aluminum. Note: mounting tool included