Features: [1] Made from strong HSS high-speed-steel, durable and firm, endurance blade offers faster cutting and extra long life for hobbyist. [2] High speed steel blades set for accurate, fast and precision cutting. ideal for cutting hard materials like woodworking, plastics, laminates, carpentry and craft. [3] Saw teeth and the machine are running in the same direction, the handle must be inserted to the bottom when used, otherwise the handle will be bent. [4] HSS segmented saw blade Set supplied with 3.17mm diameter shank drill mandrel arbour for easy fitting in any drill. for continuous cutting in drywall, plastic, aluminum, other nonferrous metals. Specification: Material: HSS High Speed Steel Extension Rod Diameter: 3.17mm(1/8”) Maximum RPM: 20,000 Blade Diameter/Thickness/Hole Diameter: 22mm/0.8mm/6.35mm 25mm/0.8mm/6.35mm 32mm/0.8mm/6.35mm 35mm/0.8mm/6.35mm 44mm/0.8mm/6.35mm Package Includes: 1 X HSS Saw Blade (22*0.8*6.35mm) 1 X HSS Saw Blade (25*0.8*6.35mm) 1 X HSS Saw Blade (32*0.8*6.35mm) 1 X HSS Saw Blade (35*0.8*6.35mm) 1 X HSS Saw Blade (44*0.8*6.35mm) 1 X 1/8" Mandrel Notes: 1. Size for manual measurement, there may be a 1 to 3 mm error, belongs to the normal phenomenon. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!