General description The GRAFF 68mm hole saw is specifically designed for drilling blind and through holes in concrete, masonry, and silicate bricks, making it ideal for tasks such as installing sockets, rosette plates, and other assembly procedures. Its unique design features robust steel construction and air holes that facilitate the ventilation of dust and chips generated during drilling. Technical specifications Diameter: 68 mm SDS Plus adapter: 110 mm (M22 thread) Center drill: 8 x 110 mm Usage Designed for impact drilling with impact drills, hammer drills, and drill presses. Asymmetric teeth made of primary tungsten carbide hard alloy enhance cutting efficiency. Special shape prevents overheating during operation.