Built with an aggressive tooth design, this hole saw delivers fast, clean cuts. An indispensable tool for installing and maintaining downlights, doorknobs, and more. It can be mounted on a hand drill, bench drill, or lathe. Features: Heavy-duty. Suitable for cutting hard materials such as aluminum alloy, sheet steel, cast metal, stainless steel, etc. It can also be used to cut uneven pieces like pipes and soft materials such as wood, plastic, PVC, plasterboard, etc. The optimized tooth design with sharper teeth allows the hole saw to easily penetrate metal for faster cuts and chip removal. Several sizes are available: 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 robust and high-strength for optimal performance. Thick walls ensure a longer lifespan. The universal hex drive fits collets larger than 10 mm. The anti-slip design effectively prevents the screw from loosening. Usage Tips: 1. Continuously add coolant when using the hole saw to prevent cracking the blade. Similar to a pistol drill, try reducing the speed when starting and stopping the drill. 2. When working with iron plates thicker than 5 mm, cut approximately 1 mm deep first. And by 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 / 7.0 cm (optional) Hole Saw Length: 7 cm / 2.75 in Suitable Collet: ≥10mm Item Weight: 140g / 4.93 oz Package Size: 11 * 5.8 * 5.8 cm / 4.33 * 2.28 * 2.28 in Package Weight: 165g / 5.82 oz Packing List: 1 * Hole Saw