M42 Hss Hole Saw Set, Ankoow 9Pcs 16-38Mm Heavy Duty Hole Saw Tooth Cutting Description: Features: Specification: Package Included: Usage Suggestion: [9 SIZES HOLE SAW IN 1 SET]: 16mm, 18mm, 20mm, 22mm, 25mm, 30mm, 32mm, 35mm, 38mm. Each hole saw drill bit is individually packaged for easy carrying and finding the required specifications. [HIGH-QUALITY MATERIALS]: Hole saw set made of M42 HSS steel and BI metal, the blade is sharp with high hardness, stronger wear resistence and long service life. [WIDE APPLICATION]: Suitable for Pistol Drill, Bench Drill,Vertical Drilling Machine etc. Widely used in Plate Hole, Home Wood, Galvanized Pipe, Fire Pipe, Plastic, Soft metal, Gypsum Board and Other Opening Operation. NOTE: Not recommend used in hard wood, hard metal and stone. [SMOOTH AND FAST CUTTING]: Teeth are sharp with little vibration, pressurized spring Improves the removal speed of cylindrical iron filler in the hole and makes chip evacuation easier. And the hole saw kit can be quickly balanced, making the operation more stable. [WARM TIPS]: Keep the hole saw drill bit be stable when, the larger the hole saw is, the slower the drill rotary speed should be, this way can protect the centre bit from getting snapped. And we recommend that customers use cutting fluid to keep the hole saw cold during use to prevent overheating, damage or even burned up.