Inner Tube Cutter Kit Installation Sequence: Extension Rod (first) - Toothed Washer - Saw Blade - Flat Washer - Screw (last). The screws must be tightened securely. Please refer to the example in the fourth image. This product is a PVC inner tube cutter and includes 4 saw blades (3 1.25-inch diameter, 1 1.75-inch diameter) and two sets of screw fasteners. Handle the saw blades with care. The saw blade surface is coated with a protective oil. The saw handle is made of high-strength carbon steel, offering high hardness, durability, and surface strength. The saw blades are made of a robust, durable, and sharp material, ideal for cutting PVC and plastic pipes, and can also be used to cut soft metal pipes. When cutting soft metal pipes, use coolant or water during the cutting process to prevent the saw blade from overheating. The total length of the cutter is 10.5 cm (4.13 inches), and the hexagonal handle is 2.8 cm (1.1 inches) long. This pipe cutter is compatible with most electric drills and is very easy to install and replace. It is compact and portable, suitable for both external and internal pipe cutting. Three important precautions: 1. Always wear gloves and safety goggles when using the tool accessories, and be aware of your surroundings. 2. The maximum speed of the saw blade should not exceed 20,000 rpm. 3. Keep out of reach of children to prevent injury. Material: Carbon steel. Color: Silver. Package contents: 1 set of internal pipe cutter. Only the above contents are included; other items are not included. Note: Light reflection and different monitors may cause the color of the item to differ slightly from the actual product. Measurement tolerance is +/- 1-3 cm.