Inside pipe cutter kit installation sequence: extension rod (first) - serrated washer - saw blade - flat washer - screw (last). The 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. Please handle the saw blade with care. There is a layer of protective oil on the saw blade. The saw handle is made of heavy-duty carbon steel for hardness, durability, and surface strength. The saw blade is strong, durable, and sharp, suitable for PVC and plastic pipes. It can also be used for soft metal pipes; when cutting soft metal pipes, use coolant or water to prevent the saw blade from overheating. The overall length of the pipe cutter is 10.5 cm (4.13 inches), and the length of the hexagonal handle 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 applications. Three major precautions: 1. Always wear gloves and goggles when using 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 x Internal pipe cutter Only the above package content is included; other items are not included. Note: Light reflection and different displays may cause the color of the item to appear slightly different from the real thing. Measurement may vary by +/- 1-3 cm.