Yato YT-4402 Hollow TCT Drill Set with SDS and Shank is a must-have tool that is suitable for professionals or enthusiasts. The hollow cylinder is made from a high-quality alloy steel material with SDS and hex shank. The working insert (Teeth) is made of high-quality tungsten carbide-tipped (TCT). Perfectly built to perform precise drilling in concrete, silicates and bricks in industry and crafts. Drill bit diameter: 6 mm. Masonry drill bit diameter: 65 mm.