The Weaver 99611: Tactical Multi-Slot Bases product offering is ideal for specific models of firearms, with a unique design that provides an extra 1\" of forward length. This feature grants a greater range of mounting options for the user.The bases are made from durable 6061-T6 aluminum, ensuring a high-quality and strong foundation for your firearm. Their protection is further heightened through a matte, Type III hard coat anodized finish that provides a sleek and polished look.Notably, these multi-slot bases are compatible with Picatinny or Weaver style rings, providing versatility for the user\'s preferred mounting style.