Yost recently launched its redesigned line of jaw covers. These jaw covers come in three different styles: Rubber, Prism, and Aluminum. Jaw covers are designed to protect delicate work from the rough serrations of the machinist jaws. What differentiates the Yost series of magnetic jaw covers is the oversized magnet on the back of the jaw cover. This full length magnet provides extra surface area to grip the front of the machinist jaws.