Material: The wall mounted hole saw is made of high quality carbide tipped metal material, stable and durable, punched quickly and in a long service life. High Efficiency: It There are two large chip openings on both sides of the cutter, the chip flutes are unique in their design, with smoother chip removal, faster speed and higher drilling efficiency. Wide Application: Mainly for opening red brick wall, adobe wall, cement wall, foam brick and masonry wall etc. Ideal for: Widely used for opening installation of air conditioner, oil smoke extractor and sewer pipe hole, ect. High Quality: High frequency welding technology, welding openings are very sturdy , smooth inner and outer welding mouth, precise engagement, appearance.