Gives a clean finish to abrasive materials such as chipboard mdf plywood and certain hardwoods for housing grooving and mortising features 2mm micrograin tungsten carbide tips for cutting the most abrasive materials to give extra long life ptfe coated indicated by distinctive black colouring can be used on hardwood softwood fibreboard plywood and particle board etched dimensions on extra long 40mm shanks specifications d1532 inch d12 mm c19 mm ol70 mm shank diameter14 inch