Feature: 1. Three‑Tooth positioning‑quick opening, accurate opening without tremor, high concentricity, reducing opening noise. 2. Selection of high quality material, make blade more sharpness and durable,beneficial to chip removal, perforation is more efficient. 3. Through a special heat treatment, incisive edge and high strength. 4. Wide application, suitable for MDF, particle board, and all kinds of wood materials. 5. Suitable for manual electric drill, support motor drilling machine and mobile tape type magnetism drilling machine. Specification: Item Type: Hole SawMaterial: Carbon steel and tungsten steel Model: 5pcs/set Applicable Machines: Row drills, bench drills, hand drills, rechargeable drills Size: Approx. 15mm / 0.6in 20mm / 0.8in 25mm / 1in 30mm / 1.2in 35mm / 1.4in Uses: Suitable for MDF, particle board, wood. Package List: 5 x Hole Saw Note: 1. The charging drill requires a high‑power model above 48V2. The electric drill needs a power above 600W3. The clamping range of the machine drill bit chuck is 10 mm and above