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TSR-W SL (Super-Low) Series Rings are designed for special applications where a low mounting solution is required. These rings are machined precisely with tolerances held to .0002" to ensure 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 feature radiused edges and corners to prevent snagging while providing an attractive appearance. The large, clamp-nut lets you torque the rings to Weaver-style or Mil-STD 1913 (Picatinny) bases. The height is measured from the top of the base to the center of the ring.