Carbon steel material: The concrete hole saw is made of hard carbon steel with high hardness and wear resistance. Fast perforation: The wall hole opener is often used with an electric hammer, simple operation and fast perforation speed. Strong practicability: Widely used in concrete, bricks, blocks, stones and clean hole cutting in air conditioning systems, etc. Firm and weld: Using high-frequency welding technology, the welding port is very bright and firm, and the wall will not be damaged. during use. Standard Diameter: The wall hole saw has standard inner and outer diameter, precise hole opening and strong practicability. Feature: Carbon Steel Material: The concrete hole saw is made of hard carbon steel with high hardness and corrosion resistance. high wear. Fast punching: The wall hole opener is often used with an electric hammer, simple operation and fast punching speed. Strong practicability: Widely used in concrete, bricks, blocks, stones and cutting clean holes in air