The Maxima Steel Bases are modeled around the popular Weaver design, which is one of the strongest and most versatile mounting systems available today. The low profile of the Maxima Steel Bases give your firearm a sleek look. Maxima Bases also offer a full width recoil slot in each base. Note: Mounting hardware included.Features:Low profile design allows use of iron sights when optics are removedFull width and depth recoil slots provide maximum bearing surface for recoil key engagementBases securely mount to your firearm with Torx-style T-15 socket cap screws, 25 in/lb. of torque is recommended