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. 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 saw blade with care. A layer of protective oil is applied on the saw blade. Saw handle is made of heavy-duty carbon steel for hardness, durability, and surface strength. Saw blade is made of strong, durable, and sharp material, suitable for PVC and plastic pipes; also usable for soft metal pipes. When cutting soft metal pipes, use coolant or water during cutting to prevent overheating. Overall length of pipe cutter is 10.5 cm (4.13 inches); hexagonal handle length is 2.8 cm (1.1 inches). Compatible with most electric drills; easy to install and replace. Compact and portable; suitable for both external and internal pipe cutting. Three safety 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 x internal pipe cutter. Note: Light reflection and display differences may cause slight color variation. Measurement tolerance: ±1–3 cm.