CK-2.75Z-FJ5 5" Flat Jaws with 16pcs Plug Screws for CK-2.75" Series Woodlathe Chuck. ATTENTION! This series of jaws are ONLY compatible with our brand's 2.75-inch chucks and CAN NOT be matched with other brand chucks on the market. PLEASE BE CAREFUL NOT TO PURCHASE THEM BY MISTAKE! These button jaws are designed for re-mounting bowls, to remove marks created by the chuck or to add Commonly used in compression mode, gripping with the long or short screw-in synthetic polymer buttons. Used to re-shape the bottoms of bowls that have already been turned. Screw-in, synthetic polymer buttons will not mark the bowl. Precision CNC machined from a special grade of medium-tensile steel, perfectly balanced for excellent concentricity and a super fine, chatter-free finish to the workpiece.