Features Cemented Carbide: The drill is forged with cemented carbide, quenched at high temperature, and has a sharp edge, which is not easy to break when cutting, and is sharp and durable. Fast Drilling Speed: Due to the high hardness of carbide inserts and strong impact resistance, the drilling speed is fast. Carbide Hammer Coring Bits feature an efficient wave design that increases energy transfer by 40% compared to other bit designs. Welding Accuracy: The cutter head adopts high-frequency welding technology, the welding port is very firm, and the inner and outer welding ports are smooth. 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. Spray holes remove cores of masonry, bricks and blocks. Main Application: This coring bit is widely used for cleaning holes in concrete, brickwork, drilling, installation of air conditioners, etc. For drilling walls, stones, bricks or installing air conditioners etc. Specification: Item Type: Thin Wall Core Bit Material: Cemented carbide Color: Silver Specification: Approx. 105mm / 4.1in Uses: Widely used for cutting clean holes in concrete, brick work, drilling stones, installing air conditioners, etc. Package List: 1 x Thin Wall Core Bit Note: Manual measurement, please allow 1‑2cm error. Package List 1 x Thin Wall Core Bit