Clinch-On 3/4? radius PUP paper faced tape-on 1/4? standard flange 90º standard angle bullnose cornerbead is an economical alternative to our traditional 3/4? radius paper faced tape-on 1/4? flange 90º bullnose cornerbead. Clinch-On PUP is manufactured with the same uniquely formulated paper, proprietary coated steel and paper-to-steel lamination as other Clinch-On products. To make the PUP an economical alternative, a lighter gauge steel is used. Clinch-On PUP paper faced tape-on standard 1/4? 90º bullnose cornerbead with a 3/4? radius is designed for 90º outside corners.