Merk Hiroki Specifications: Material: Steel Arbor size 16MM(3/5"") Diameter 110MM(4"") Maximum speed (rpm) 25000 Product Weight 158g Wheel thickness (in.) :0.5cm Diameter:4"" 100mm Arbor:5/8""10000-13000rpm 14000rpm Max Specifications: Grinder Disc Chain Saw takes the muscle work out of cutting, carving, removing and sculpting of wood, plastics, ice and hard rubber with their speed and maneuverability. The chain saw blade is held in place between two steel plates which provides a secure grip for carving. Regardless of grain or knots the blade cuts through the material with ease to the user.