Features： 1、Carbon Steel Material: The concrete hole saw is made of hard carbon steel material with high hardness and wear resistance. 2、Fast Perforation: The wall hole opener is often used with an electric hammer, simple operation and fast perforation speed. 3、Strong Practicality: Widely used in concrete, bricks, blocks, walls, stones and clean hole cutting in air conditioning installation, etc. 4、Firm and Smooth Welding: Using high frequency welding technology, the welding port is very glossy and firm, and the wall will not be damaged during use. 5、Standard Diameter: The wall hole saw cutter has standard inner and outer diameter, precise hole opening, and strong practicability. Specification： Item Type: Concrete Hole Saw Material: Carbon steel Application: Widely used in concrete, bricks, blocks, walls, stones and clean hole cutting in air conditioning installation, etc. Package List： 1 x Concrete Hole Saw