Alum alloy seamless tubing; anodized, black matte; 43.120 in. Oa lg; 2.084 in.Id; 2.250 in.Od; engra=e complete circle every 6 inches, other inch marks 0.760, characters 0.150 h, lines 0.010 deep x 0.015 w; engrave legend and pn 11584733 as shown on dwg; fill all engravings with permanent white finish