No. 12F - 12 inches (305 millimeters) long tool is ideal for HVAC applications such as 3/8 inch (9.5 millimeters) folds for drive cleats and big 1 inch (25.4 millimeters) deep folds for joist panning, plenums, register boots, trunk line end caps and more
Longer No. 18F - 18 inches (457 millimeters) tool assures a uniform fold
Extra long No. 24F - 24 inches (610 millimeters) tool may also be used as a mini brake by siding applicators