General description High-speed HSS hole saw set designed for efficient cutting through various materials including wood, plastic, and metals. This 5-piece set includes hole saws with diameters of 16mm, 18.5mm, 20mm, 25mm, and 30mm, all crafted from high-speed steel (HSS) for durability and precision. Technical specifications Material: HSS6542 Hardness: HRC 65 Surface Treatment: Titanium Coating Hole Saw Diameters: 16mm, 18.5mm, 20mm, 25mm, 30mm Shank Diameter: 8mm Hole Saw Blade Length: 65mm Package Weight: 308g Compatibility and accessories Compatible with bench drills, electromagnetic drills, pistol drills, and impact drills Includes an Allen key for removing the pilot drill bit Installation Designed for easy installation on locks, knobs, and larger diameter holes Usage Use oil or water to lower temperature when drilling hard materials to prevent drill bit breakage Wear goggles and a protective mask when working Use earplugs for prolonged use to reduce noise Remove anti-rust oil after use for longer service life Choose a lower speed for continuous cutting Avoid strong impacts on the edge of the hole saw to prevent blade breakage Use coolant when working on hard materials Other information Spring design for efficient chip removal Hexagonal handle design for stability and to prevent slipping