APPLICATION - GRAFF 68mm hole saw is designed for drilling blind and through holes in concrete, masonry and silicate bricks, under sockets, rosette plates and other assembly procedures. UNIQUE DESIGN - Our drill bit is made of robust steel and has air holes for free ventilation of dust and chips generated during drilling. The SDS drill bit set consists of a fully cast body and is equipped with a replaceable center drill. BENEFITS - The 68 mm concrete drill bit has asymmetric teeth made of primary tungsten carbide hard alloy with segments made of welded cuts. NO OVERHEATING - The GRAFF carbide hole saw does not overheat due to its special shape and is intended for impact drilling with impact drills, hammer drills and drill presses. FEATURES - Diameter: 68 mm, SDS Plus adapter: 110 mm (M22 thread), center drill: 8x110 mm.