The 1-Chained Light Duty Chain Knocker is a perfect choice for plumbing professionals who need agile and effective descaling done for hard-to-reach areas inside PVC or any other soft material pipes. The single-chain design ensures smooth navigation through bends, mirroring the flexibility of your flex shaft. Basically it goes wherever the flexible shaft can go. How does it perform compared to other chain knocker options? In comparison this 1-Chained option offers a slightly broader cleaning surface with the cost of flexibility than Mini Chain option and a bit more flexibility with slightly lesser descaling speed than the 2-Chained option. For maximum flexibility, with the cost of cleaning surface the Mini Chain is slightly better option. When looking slightly less flexibility and more descaling speed from the chain, we recommend considering the 2-Chained option. If you mostly have straight line with barely any bends we highly recommend considering the 3-Chained option to speed things up. We still recommend having at least one flexible option with you than the 3-Chained. Perfect tool for PVC/ABS and other soft material pipe descaling Like all the other Light Duty Chains, this 1-Chained option does not have any kind of hard metal (carbide) tips like Medium or Heavy Duty Chain Knockers do. This minimizes the risk of damaging the pipe's interior, making them the ideal choice for cleaning & descaling tasks in PVC, ABS, PEX, Copper and other fragile/soft pipes.Light Duty Chains are also a great option when a pipe made from tougher material is in considerably rough condition (cracks etc) and you don't want to take any risks. So if you want you can also use these chains in Cast Iron pipes as well. While we recommend this chain knocker for soft material pipes like PVC, please always check that the overall condition of the pipe to avoid any damage. If you are unsure if the pipe will withstand the Light Duty Chain Knocker, please choose even more gentle option like Circular Light Duty Chain Knocker or Gentle Duty Brush. Available in following sizes: 32mm (1¼”) for flex shaft thicknesses of 6mm (¼″) and 8mm (⁵⁄₁₆″) 50mm (2″) for flex shaft thicknesses of 6mm (¼″) and 8mm (⁵⁄₁₆″) 75mm (3″) for flex shaft thicknesses of 8mm (⁵⁄₁₆″) 100mm (4″) for flex shaft thicknesses of 8mm (⁵⁄₁₆″)