They are fitted with an X-CEL Knob that can cut tubing more quickly and easily thanks to the larger, more ergonomic design. They can cut through copper, brass, aluminium and thin-wall steel. Models 10, 15 and 20 feature a convenient fold-away reamer.About Ridgid: The inventor of the modern pipe wrench, Ridgid has been designing and crafting industry-leading products since the 1920's. Ridgid's mission is to build tools for the world's expert tradespeople - those who know the limits of the job and how to exceed them. Why do so many professionals choose Ridgid tools? The answer is simple, trust. Millions of Ridgid tools go to work every day in plants, on construction sites and in countless other harsh environments. These tools operate in extremes of heat and cold, withstand dirt and mud, and perform reliably day in and day out. Ridgid toolsare known throughout the world as industry-leading products that allow professionals to complete jobs more quickly and reliably. Ridgid - Built For Those Who Know!