Material: The wall hole saw is made of metal material with a high-quality carbide tip, stable and durable, quick drilling and long service life. High efficiency: There are two large chip openings on both sides of the cutter, the chip flutes are uniquely designed, resulting in smoother chip removal, faster speed, and higher drilling efficiency. Wide application: Mainly for opening red brick walls, rammed earth walls, concrete walls, foam bricks, and masonry walls, etc. Ideal for: Widely used for installing air conditioners, oil smoke extractors, and sewer pipe holes, etc. High quality: High-frequency welding technology, the welding openings are very robust, smooth internal and external welding mouth, precise engagement, appearance.