Features 1、NOT EASY TO COLLAPSE: Using internal, medium and external three flute design, bring higher efficiency, not easy to collapse 2、REDUCE RESISTANCE: The cut out design is larger, which reduces the resistance when opening the hole greatly, more smooth to drill 3、FAST DRILLING SPEED: Drill bit possess fast drilling speed, round hole without gap, bring high working efficiency, saving both labour and time 4、CUTTING VARIOUS MATERIALS: Hole saw drill bit is suitable for cutting steel, aluminum and other metals, plastics or wood 5、HIGH SPEED STEEL MATERIAL: Made of good quality high speed steel material, come with corrosion resistance, good mechanical properties, and high strength Specification Item Type: HSS Drill Bit Hole Saw Material: HSS Opening Diameter: Approx. 22.5mm / 0.89in Uses: Used for steel, aluminum and other metals, plastics or wood Package List 1 x HSS Drill Bit Hole Saw 1 x Hex Wrench 1 x Spring