Inside pipe cutter kit installation sequence: extension rod (first) – serrated washer – saw blade – flat washer – screw (last). Screws must be tightened and reinforced. Refer to the fourth photo for example. A PVC pipe internal cutter with 4 saw blades (3 blades with 1.25 inch diameter and 1 blade with 1.75 inch diameter), and two sets of screw fastening parts. Handle the saw blade with care. A layer of protective oil is applied on the saw blade. The saw handle is made of heavy-duty carbon steel for hardness, durability, and surface strength. The saw blade is made of strong, durable, and sharp material, suitable for PVC and plastic pipes, and can also be used for soft metal pipes. When cutting soft metal pipes, use coolant or water during cutting to prevent the saw blade from overheating. Overall length of the pipe cutter is 10.5 cm (4.13 inches); hexagonal handle length is 2.8 cm (1.1 inches). The pipe cutter is compatible with most electric drills and is easy to install and replace. Compact and portable, it is suitable for both external and internal pipe cutting. Three major precautions: 1. Always wear gloves and goggles when using tool accessories and remain aware of your surroundings. 2. Maximum saw blade speed must not exceed 20,000 rpm. 3. Keep out of reach of children to prevent injury. Material: carbon steel. Color: silver. Package contents: 1 set internal pipe cutter. Note: Light reflection and display differences may cause slight color variation. Measurement tolerance: ±1–3 cm.