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.