Each hole saw set is individually packaged, Ø90 mm High performance - The hole saw has a heat-treated M42 bi-metal saw blade and the cutting part is made of high-quality high-speed carbon steel. The product has the advantages of high temperature resistance, no deformation and long service life. The sawtooth cutting design features a circular arc design, concentric high precision, uniform tooth edge, impact resistance and drop resistance. Equipped with a non-binding thread edge for easy drilling, the drill spring automatically pushes the disc out of the saw. Widely used for metal steel, castings, aluminum alloy, plastic and other metal pipe joints, galvanized pipes, fire hoses, various woods, gypsum boards, etc. Applicable to: bench drills, drilling machines, pistol drills, various hand drills, etc. Note: The data is all measured manually, please allow an error of 1-3cm. Due to the difference in light and display, there will be a certain color difference.