TR17D have a centre tip for drilling abrasive materials and are designed to work with the Trend Worktop jigs Dimensions: Shank: 1/4in Cutting Diameter (D): 12.7mm Cutting Length (C): 50.0mm Trend Trade range two flute router cutters have extra long shanks and are designed to meet the demanding needs of the professional trademen. They have a 2mm micrograin Tungsten Carbide tips for cutting the most abrasive materials to give extra long life. They have a PTFE coat, indicated by distinctive black colouring and produce a clean finish to abrasive timbers such as chipboard, MDF, plywood and certain hardwoods. The dimensions are etched on the extra long 40mm shanks for quick identification and are suitable for mortice and worktops applications.