Steiner, T Series, Scope Rings, 30mm Low, Black, Fits Picatinny WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Scope Ring Pair Fits Picatinny For 30mm Scopes Low Height Thumb Screw Attachment Product Description Steiner Rings are the foundation of a precision shooting system. Designed and engineered to guarantee precise optical alignment and shot-after-shot accuracy. The T-Series Rings offer the perfect riflescope mounting solution for precision tactical shooting.