Comes with 2 extra replaced blades. Heat-treated steel, 1.2 mm blade thickness, black coating ensures durability. Sharp saw-tooth design for faster cutting Nickel-plated shaft can effectively prevent the product from corrosion. With high hardness, the tool ensures daily operation needs, and can cut up to 6 mm thickness PVC pipe, plastic pipe Need to connect with power drill to use, and is easy to installation. Could be a great helper in cutting out drain stubs or repairing broken pipes TIPS: Before cutting in a pipe, please make sure the blade is locked tightly into the shaft. Otherwise, the inner pipe cutter may not exert its function well Caution: When the cutter is connected with a drill, it could be dangerous. Be aware of the sharp edge, and always wear protection to avoid hurting