Features Cemental Carbide The drill bit is forged from carbide, quenched at high temperature, and has a sharp edge, which is not easy to break when cutting, and is sharp and durable. Accuracy welding: the cutting head uses high frequency welding technology, the welding opening is very firm, and the inner and outer welding openings are smooth. Main Application This drill bit is widely used for cutting clean holes in concrete, masonry, drilling stones, installing air conditioners, etc. Fast drilling speed: due to the high hardness of the carbide inserts, it has strong impact resistance and fast drilling speed. Durable: our products have been tested to show that they are not easy to break after repeated high frequency use and can be used for a long time. Specification: Item Type: Thin Wall Drill Bit Material: carbide Colour: silver. Specification: approx. 105 mm / 4.1 inches. Usage Widely used for cutting clean holes in concrete, masonry, drilling stones, installing air conditioners, etc. Package list: 1 x thin-walled drill bit. Small note: Manual measurement, please allow 1-2 cm error. Package List 1 x Thin Wall Core Bit