Feature: *Adjustable Metal Wood Circle Hole Cutting Drill Bit Cutter for 30mm-120mm/200mm/300mm tool holder; Alloy Nickel Plated Blades Suitable for 4 0mm-120mm/200mm/300mm . *Help you cutting wood circles,so you can use it as a drill bit or as a hole opener. *Ordinary steel blades can be used to make holes in softwood and thin boards. *Alloy blades can be used on softwood, thin boards, plastics, hardwood and thin iron sheets, but they are not . *Alloy nickel-plated blades can be used on softwood, thin wood, plastic, hardwood and thin iron sheets. Precautions: 1. When the hole cutting is working: punch holes horizontally and vertically. 2. When working with metal, it is necessary to add water to continuously cool down. 3. The drilling speed of the drill bit should be slow at the start, and the contour can be accelerated slowly. 4. Please pay attention to be safe when operating. Specifications: Product name: Circle Hole Cutting Blades Optional Material: Steel, Alloy, Alloy Nickel Plated Color: Black, Silver Length: (Approx. ) 45mm(Steel) / 50mm(Alloy) / 48mm( Alloy Nickel Plated ) Effective processing depth: 30mm Suitable for: drilling holes in softwood and thin wood, plastic, Hardwood, iron sheet. Quantity: 1pair(2pcs) Package Included: 1pair Circle Hole Cutting Blades (Blade only, tool holder not included) Note: 1.Transition: 1cm=10mm=0.39inch. 2. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3. Please allow slight manual measurement deviation for the data. _x000D_ _x000D_