SincereetaliBuilt with an aggressive tooth design, the saw delivers fast and clean cuts. An indispensable tool for installing and maintaining downlight, door knob, etc. You can install it on hand drill, bench drill and lathe. Features: Heavy duty. Applied for cutting on hard materials like aluminum alloy, steel sheet, cast metal, stainless steel sheet, etc. Also can be applied for cutting uneven workpieces like pipes and soft materials like wood, plastic, PVC, gypsum board, etc. Optimized tooth design with sharper teeth, the hole saw easily penetrates the metal for faster cutting and chip removal. There are multiple sizes optional: 1.2 / 1.4 / 1.6 / 1.8 / 2.0 / 2.3 / 2.8 / 3.0 / 3.2 / 3.5 / 3.8 / 4.0 / 4.5 / 5.5 / 7.0 cm. Made of high speed steel, the saw is sturdy and high strength for optimum performance. Thick walls for longer service life. Universal hex drive fits the collet over 10mm. Anti-slip design effectively prevents the screw from loosening. Using Tips 1. Continuously add coolant when using the hole saw to avoid cracking the blade. Take the gun drill as an example, try to reduce the speed of the dill when turning on/off. 2. First cut about 1mm depth when handling the thicker iron plate more than 5mm. And using a spit drill to drill a hole along the saw kerf for easy chip removal. Specifications: Material: HSS (High Speed Steel) Color: Silver Hole Size(Dia.): 1.2 / 1.4 / 1.6 / 1.8 / 2.0 / 2.3 / 2.8 / 3.0 / 3.2 / 3.5 / 3.8 / 4.0 / 4.5 / 5.5 / 7.0cm (optional) Hole Saw Length: 7cm / 2.75inch Suitable Clamp: 10mm Item Weight: 140g / 4.93oz Package Size: 11 * 5.8 * 5.8cm / 4.33 * 2.28 * 2.28in Package Weight: 165g / 5.82oz Packing List: 1 * Hole Saw