This tool is designed to be used in conjunction with the Everglades Ammo 1911 Frame Rail Cutting Fixture. After you cut your frame rails to plus dimensions, use this tool to stone or sand the rails to final dimension. Designed to hold the stone perpendicular to the frame rails for precise control of the final dimensions. Includes one 320 grit stone. Works with 1911 or 2011 style frames. Mfg: Everglades Ammo