APPLICATION - The GRAFF 68mm hole saw is intended for drilling blind and through holes in concrete, masonry and silicate brick under electrical outlets, rosette plates and any other mounting procedures. UNIQUE CONSTRUCTION - Our core 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 equipped with a replaceable center drill bit. ADVANTAGES - The 68mm concrete drill bit has asymmetrical teeth made of primary tungsten carbide hard alloy with welded cutting segments. NO OVERHEATING - The GRAFF carbide hole saw does not overheat due to its special shape and is intended for impact drilling with a hammer drill, rotary hammer, and drill. FEATURES - Diameter: 68 mm, SDS Plus Adapter: 110 mm (M22 thread), Center Drill: 8x110 mm.