Easily convert .22-250 and .308 short action, long action, and magnum length detachable magazines from H-S Precision to reliably feed 43 of the most popular rifle cartridges. Milled slot with beveled edge slips over the feed lips, so you can confidently tweak the front and rear widths to caliber-specific dimensions listed on the tool. Aluminum construction prevents scratches to the magazine finish. Provides adjustment for most commercial cartridges from .22-250 to .458 Win Mag. SPECS: Aluminum, natural finish. 3' (7.6 cm) long, 1-13?16' (4.6 cm) wide, 3?8' (9.5 mm) thick. Designed for use with H-S Precision, Remington 700 Detachable Magazines only.