ProSTUD 144 ProSTUD® Drywall Framing System with 1-7/16" Flange. Select markets only. SELECT MARKETS ONLY 1-5/8" PRO20 (18mil) 144 2-1/2" PRO20 (18mil) 144 3-5/8" PRO20 (18mil) 144 4" PRO20 (18mil) 144 6" PRO20 (18mil) 144 1-5/8" PRO20 (22mil) 144 2-1/2" PRO20 (22mil) 144 3-5/8" PRO20 (22mil) 144 4" PRO20 (22mil) 144 6" PRO20 (22mil) 144