Maxima Fixed Rings are designed to be the strongest, most durable fixed mounting systems available. They utilize 4T-15 Torx style cross slot bases and incorporate a Warne square stainless steel recoil control key in both the front and rear rings. The square recoil key also protects against swaging or peening of the bases. The Maxima Fixed Ring band is also substantially wider for additional clamping surface around the scope to hold the optics firmly in place. Warne Maxima Scope Rings are designed to fit Warne bases as well as all Weaver cross slot and Mil-Spec Picatinny style bases and rails. Remove the 4 screws from both rings. Place the scope in the ring halves and re-insert recoil key. Start all 4 screws on both rings and move scope with rings to your scope bases. Place rings onto the bases with the recoil keys in the slots. Push each ring towards the muzzle to seat the recoil key and tighten only the bottom screws to 25in/lb* max. Adjust eye relief and level the reticle. Once both are correct, tighten the top screws on both rings to 25 in/lb* max. Item #: 213M Height: Low Fits Objective Size: 24-42mm Dimension A: 30mm Dimension B: 0.250? Dimension C: 0.705? Weight: 4.6 oz.