Heavy duty tungsten carbide tipped core drills 110mm cutting depth. For cutting fast clean holes in, concrete, aerated block. light to medium density bricks, blocks and masonry.Come with a SDS puls shank for this cement drill bits, male thread adapter design, match your drill chuck fastening and much more improve speedier drillingThe concrete hole saw kit made of tungsten steel and alloy, high-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth. Ultra-sturdiness and durable, easy to opearation, and long service life.