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 procedure. UNIQUE CONSTRUCTION - Our core bit is made of durable steel and features air holes for free venting of dust and chips generated while drilling. The SDS drill bit set is constructed in a fully cast body and fitted with a replaceable center bit. BENEFITS - The 68mm concrete bit has asymmetrical hard alloy primary tungsten carbide teeth with segments of cutting welded. 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, hammer drill and drill. FEATURES - Diameter: 68mm, SDS Plus Adapter: 110mm (M22 thread), Center Drill: 8x110mm.