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TSR SL (Super-Low) Series Rings are designed for those special applications where an extremely low mounting solution is required. These rings are precisely machined with tolerances held to .0002" to provide maximum scope/ring contact. They hold the scope securely against recoil. The four-screw cap allows you to align the reticle, tighten the left side of the cap, then the right side without the scope rotating. The rings have radiused edges and corners to help prevent snagging, while also providing an attractive appearance. The large clamp-nut lets you torque the rings to Mil-STD 1913 (Picatinny) bases. The height of the rings is measured from the top of the base to the center of the ring.