With a little practice, these hardened steel louver dies, and the Eastwood Bead Roller (32044,28187, 21327, and 21487) you\'ll be able to produce professional looking louvers. Produces 3/4\" wide by 3/16\" high louvers Works on up to 18 gauge steel and 14 gauge aluminum Fits bead rollers with industry standard 22mm shafts Multiple passes allow the hardened steel louver dies to slice and progressively form the louver profile End contours can be formed with The Eastwood 13146 Trim Hammer and 28030 Panel Beater Bag.