In 1970, the Whiteside Machine Company began manufacturing special parts and making repairs for the furniture industry in Hickory, NC. As the company's reputation grew, they expended their operations to include product offerings for businesses and hobbists, including high-quality router bits. Today, Whiteside router bits are the undisputed favorite among woodworkers. Bearing lock collars are used on the shanks of router bits when following a template. Model LC-1/4: 1/4" inner diameter, 7/16" outer diameter.