Core drill a bit for drilling holes in concrete, cement, brick, stone and other hard materials. The drill bit is made of quality and high-strength metal with a carbide tip, which will not dull due to a certain margin of wear resistance. The crown is made using quality and professional welding, which makes the teeth hold very firmly.  The kit supplies a drill bit, a long shaft and three crowns: for 50, 40 and 30 mm, as well as a wrench. Customers who have already ordered the product, in the reviews note the quality of the product and fast delivery.