All flaring tools listed are recommended for soft materials such as aluminum and soft copper. No. 454W, No. 455, and No. 375 will also flare steel, stainless steel, hard copper, and brass. No. 458R and No. 377 will flare steel, stainless steel, hard copper, and brass thru wall thickness of .035 inches. No. 458R this precision tool provides smooth, uniform flares with minimum effort. The ratcheting feed screw handle turns easily and requires less motion and effort than a standard handle. Hardened steel flaring cone.