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: 1.30" - ring overall height: 2.20" - weight: 1.90 oz - finish: • black anodized aluminum. Note: mounting tool included