Item Type: Wall Core Bit_x000D_Material: Carbide_x000D_Colour: Silver_x000D_Specification: Approx.70mm/2.8in_x000D_Usage: Widely used for cutting clean holes in concrete, brick work, drilling wall, stone, installing air conditioner, etc. 170mm Wall Hole Opener: The specification of this wall hole opener is 70mm, which is forged by carbide and quenched at high temperature 2Sharply Blade Edge: The wall hole saw blade edge is sharply, not easy to break when cutting, provides efficient cutting 3High Performance: The concrete wall hole opener has high hardness, strong impact resistance and fast drilling speed 4High Frequency Welding Technology: This wall hole cutter adopts high frequency welding technology, the welding opening is firmly, the inner and outer welding ports are smoothly, and the joint is precise 5Wide Range of Usage: This wall hole saw is widely used for cutting clean holes in concrete, brick work, drilling wall, stone, installing air conditioner, etc.1 x_x000D__x000D_WallCoreBit