1Stable, heat-resistant, wear-resistant, long life. 2Fully polished chrome-plated surface, anti-corrosion protection, high hardness, durable and reliable. 3The twisted drill is made of high speed steel and has high hardness and durability. 4Strong and more durable, it can withstand longer tool life and faster masonry performance. 5High-hardened cutting edge, four-slot chip removal to help improve work efficiency
