13 x HOLE SAW BLADES and 39 ACCESSORIES13 x Bi-metal Hole Saw Blades, 13 x Mandrels, 13 x Drill Bits, 1 x Box. Each hole saw kit is fully matched and individually packaged, which effectively avoids the situation where the drill holder cannot be removed and other saw blades cannot be used after using one size saw blade. HIGH PERFORMANCE-The hole saw adopts heat-treated M42 bimetal saw band, and the cutting part is made of high-quality high-speed carbon steel.The product has the advantages of resistance to high temperatures, no deformation and long service life. The diameter is 18, 20, 22, 25, 28, 30, 35, 38, 45, 50, 55, 65, 75mm and the maximum cutting depth/thickness is 25mm CUTTING DESIGNThe sawtooth adopts arc design, concentric precision, uniform tooth edge, impact resistance and anti-drop. The hole saw kit adopts non-binding sharp edge design, which is easy to cut. After drilling, the drill spring will automatically push the disc out of the saw. WIDE APPLICATIONSuitable for metal pipe fittings such as metal steel, castings, metal alloys. aluminum, plastic plates, galvanized pipes, fire-fighting pipes, all kinds of wood, plasterboard, etc. Suitable for: bench drills, pillar drills, gun drills, various hand drills, etc. NOTEWhen using the hole opener kit for a long time, please control the rotation speed appropriately, RPM1000, it is easy to cause high-speed wear of the hole opener. The surface of the product is coated with a thin layer of protective oil (anti-oxidation, anti-rust), be careful not to stain, and check the condition of the hole opener Adding liquid cooling when opening metal materials; When the center positioning drill is drilled, you should pay attention to start drilling slowly If there is any abnormality or unsatisfactory chip removal during the operation, you should stop working and continue working after pouring the chips When processing the thickness of more than 10mm, the spring of the positioning drill should be removed