HSS mini circular saw blades are of harden texture and high cut resistance. Nice tools set for cutting aluminum alloy, PVC, wood and plastic, either at professional cutting work or in daily DIY use. Specification: Hole diameter: 6.35mm Blade Diameter: 22mm, 25mm, 32mm, 35mm, 44mm, 50mm Mandrel Shank Diameter: 1/8"(3.175mm) and 1/4"(6.0mm) Material: High speed steel Maximum RPM: 20,000 Package Includes: 2 X HHS Saw Blade(22*0.8*6.35mm) 2 X HHS Saw Blade(25*0.8*6.35mm) 2 X HHS Saw Blade(32*0.8*6.35mm) 2 X HHS Saw Blade(35*0.8*6.35mm) 2 X HHS Saw Blade(44*0.8*6.35mm) 2 X HHS Saw Blade(50*0.8*6.35mm) 2 X 1/4"(6.0mm) Mandrel 2 X 1/8"(3.175mm)Mandrel NOTICE: When you put a piece of mini circular saw blade in use, on the assumption that the operation requirements are met, please try to choose the smallest one as you can and try to set the lowest rotational speed as you can. When set a mini circular saw blade on a grinding machine, please plug the rod in as deep as you can. If the rod is chucked too short, the center of the circular saw blade may not be in right position. With high rotational speed and large circular saw blade, the rod will spin off and get bent.