APPLICATION - The GRAFF 68mm hole saw is designed for drilling blind and through holes in concrete, masonry, and silicate brick under electrical sockets, rosette plates, and any other mounting procedure. UNIQUE CONSTRUCTION - Our core drill bit is made of durable steel and features ventilation holes for free ventilation of dust and chips generated during drilling. The SDS drill bit set is constructed in a fully cast body and features a replaceable center tip. ADVANTAGES - The 68 mm concrete drill bit has asymmetrical teeth made of hard primary tungsten carbide alloy with welded cutting segments. NO OVERHEATING - The GRAFF carbide hole saw does not overheat thanks to its special shape and is designed for impact drilling with a hammer drill, rotary hammer, and drill. FEATURES - Diameter: 68 mm, SDS Plus adapter: 110 mm (M22 thread), center tip: 8 x 110 mm.