Features Carbide The drill bit is forged with carbide, quenched at high temperature, and has a sharp edge, which is not easy to break when cutting, and is sharp and durable. Stable performance and strong practicality. FAST DRILLING SPEED Thin wall core drill bits have fast drilling speed due to the high hardness of carbide inserts and strong impact resistance. High quality, reliable and safe. 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. Exquisite workmanship, smooth and delicate appearance, durable and long lasting. 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. Small, lightweight, easy to carry, I believe it can make your life more comfortable. Main Application This core drill bit is widely used for cleaning holes in concrete, masonry, drilling, installing air conditioners, etc. The effect is extensive and the effect is obvious. 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 wall drill bit. Note: Manual measurement, please allow 1-2 cm error. Package List 1 x Thin Wall Core Bit