Our 19″ Wide gap hemming tool features a 3/16″ overall gap that can accommodate most roof panels with pencil ribs, striations and grooves. This tool can be used on metal panels up to 19″ wide to form hems as deep as 1-1/2″. The hem is determined by how far back you notch the roof panel ribs.
How to use it:
A. Notch the roof panel ribs back. If you want a 3/4″ hem, notch the panel ribs 3/4″. If you want a 1″ hem, notch the ribs back 1″
B. Slip the flat of the panel between the blades of the hemming tool and slide it against the panel ribs
C. Bend the panel under until the hemming tool contacts the bottom of the panel