"AFCO’s new black swaged steel tubes are formed using .095” DOM material. This tubing is placed in a swaging machine that forms the reduced end size using a series of hammer-to-die blows. The finished product has reduced ends with wall thickness that stays within +/-.001”. AFCO Swaged Steel Tubes are produced with NO stretching or crimping. Choose AFCO for the best built tubes on the market for strength and weight savings. • Consistent wall thickness allows better thread engagement. • Black zinc-plated for increased part life. • 3/4” and 5/8” threaded tubes for all popular applications. • Deep knurl for easy length adjustments. • New black finish! "