Ripper Heavy Duty Tungsten Carbide Tipped Hole Saw Heavy duty abrasion resistant tungsten carbide teeth will cut materials that quickly dull normal hole saws. Heavy duty construction for long life with large gullets for easy slug removal. Ideal for cutting timber and all types of composite board, particularly MDF. Ripper hole saws are also suitable for cutting wood laminates, plywood, insulation and fibre cement sheet.