The Planet TCT Hinge Sinkers feature a specially designed cutter which is ideal for fixing concealed hinges in cabinets. With these Hinge sinkers, you can cut through timber, composite board, plastics, and many other materials. The spurs and the cutter blades are Tungsten Carbide Tipped or TCT for short. Overall the Planet TCT Hinge Sinkers are very cost effective, especially if you are a kitchen fitter, woodworker, or just doing DIY tasks. 26mm: HS26TC