Tungsten carbide-tipped multi-purpose hole saws are designed for use in a wide variety of materials such as soft and hardwoods, chipboard, plywood, MDF, plastic, gypsum/plasterboard, tiles, solid brick, brick with cavities, concrete block, lightweight aggregate block, breeze block and soft density lime-sandstone building block (max 30 N/mm2 hardness). Long Lasting Construction Grade Carbide: a special formulated construction grade carbide is used for the cutting teeth, which provides 10 times longer cutting life.