The Maxima Fixed Ring Series fit Weaver style cross slot bases and incorporate a Warne square stainless steel recoil control key in both the front and rear rings. This ensures a no slip positive recoil surface across the entire slot of the base and is capable of withstanding the heaviest of recoil. The Maxima square recoil key also protects against swaging or peening of the bases when used on softer or less durable materials. The Maxima Fixed Ring band is also substantially wider for additional clamping surface around the scope to hold the optic 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. Features Permanently attaches to base. Square recoil control key for positive engagement of ring to base. Rings securely mount around scope using 4 Torx style T-15 socket cap screws, 25 in/lb. of torque recommended. Specs Part Number: 214 Ring Height: Medium Fits Objective Size (Approx): 42-52mm objective Dimension A: 30mm Dimension B: .375" Dimension C: .705" Weight: 4.3oz Instructions 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.