Punched channel with 1″ flanges on either side of thepunched bar. The punched bar portions consists of round holes for 1/2″ bolts and square holes for 1/4″ carriage bolt or machine screw. Channels available in either aluminum, hot dipped galvanized steel or stainless steel, in 1″, 1-1/2″, 2″, 4″ and 6″ widths and in 10 ft or 20 ft lengths. Punched channels, when combined with corresponding fittings, create protective instrument support systems forsingle tube, multi-tube and electronic cable in marine and industrial environments. Manufactured in the USA.