Features Cemented Carbide: The hole opener is forged from cemented carbide and has been quenched at high temperature. The cutting edge is incisive, the hardness is high, the cutting is not easy to break, and it is incisive and durable. Anti Shock: The carbide tipped blade of the hole saw has the characteristics of high hardness, strong impact resistance and fast drilling speed. Drilling Good Helper: The thin wall core bit can be widely used to cut clean holes in concrete, brick work, drilling stones, installing air conditioners, and more. Welded Firmly: The cemented carbide hollow hole opener adopts high frequency welding technology, so the welding opening is very firm, the inner and outer welding ports are smooth, precise joint, and the appearance is flat. Durable: The cemented carbide thin wall core bit has been tested to show that they still have very fast hole opening speeds after repeated high frequency use, so you can use them for a long time. Specification: Item Type: Thin Wall Core Bit Material: Cemented Carbide Color: Silver Diameter: Approx. 95mm / 3.7in Uses: Widely used in concrete, brick work, drilling wall, stones, air conditioning installation and other places to cut clean holes. Package List: 1 x Thin Wall Core Bit Note: Manual measurement, please allow 1‑2cm error. Package List 1 x Thin Wall Core Bit