Material: The wall hole saw is made of high quality cemented carbide material, stable and durable, punching fast and long service life. High efficiency: There are two large chip openings The chip grooves on both sides of the cutter feature a unique design, with smoother chip removal, faster speed and higher drilling efficiency. Wide application: Mainly used for opening red brick walls, rammed earth walls, cement walls, foam bricks and masonry walls, etc. Ideal for: Widely used for air conditioning installation, oil smoke vents and sewer pipe holes, etc. High quality: High frequency welding technology, the welding openings are very sturdy, smooth inner and outer welding mouth, precise locking, appearance.