Series 550, Tungsten Carbide-Tipped Hole Saws

               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 bricks and bricks with cavities, aerated concrete blocks, lightweight aggregate blocks and breeze blocks, soft density lime-sandstone building blocks (max 30 N/mm2 hardness).   TECHNICAL FEATURES:-Perfect round backplate.-Fast & easy center drill change.-Large chip clearance slots.Long lasting construction grade carbideCutting teeth are made of a specially formulated construction grade carbide which provides a longer cutting life.Secured tooth technologyAs a result of the latest technology, teeth are secured to prevent any breakage during impact with hard materials.   NOTE: All hole saws require an interchangeable Fast Lock™ center drill that allows changing between sizes in seconds without tools. Order center bit as determined by the diameter of the hole saw. 550-HS1 is