The Whiteside 13-1250A Screw Type Helix Router Bit is manufactured by Whiteside Machine Company. It features a 1/2 inch cutting length, a 1-1/4 inch cutting diameter, and 5/16-24 threads with a 1/2 inch overall length. This router bit is designed for woodworking applications, specifically for creating precise cuts and shaping wood. The screw type helix design helps to efficiently remove material while providing a smooth finish. This tool is suitable for use with a router to achieve accurate and clean cuts in various woodworking projects.