Each Weaver base is machined to tight tolerances for a custom fit. These aluminum bases offer maximum strength for rings to hold tight. Product Features Machined to tight tolerances for a custom fit Made in America Offer the rock solid Weaver cross-lock design to fit a variety of rings Torx heads and driver included Product Specifications Base Type: 1 Piece Base Material: Steel Style: Standard Finish: Gloss Black Fits: Marlin 36, 336, 444, 1895, 9, 45, 922M