The ROBERTS Economy Adjustable Knee Stop is the ideal tool for tensioning carpeting during installation. It is manufactured using extra heavy duty aluminum castings and powder coated industrial steel for a strong and durable product. Dual locking pins allow for easy length adjustments from 19 to 23 inches, and the high contoured neck allows for easy maneuverability. The readable and adjustable piercing depth dial allows you to use the kneeler for various carpet types and sizes, from large to small. The tool is easy to use, so it's great for both beginners and professionals in the business.