CHANNEL DIES CH150-CH151 CH150-CH151 DIESET IS SUGGESTED FOR SMALL U CHANNEL. ROCKER INSERT OVERBENDS SHAPE TO ALLOW FOR SPRING BACK. CH160-CH161 CH170-CH171 CH160-CH161 DIESET WILL PRODUCE A CHANNEL WITH A WEB WIDTH OF 3/4" OR LESS. IF FLATNESS IS IMPORTANT, DIESET CH170-CH171 IS RECOMMENDED. CH180...