A type of interlocking two separate metal panels by folding one panel over on top itself and the folding the other down under itself and then hooking the panels together
A type seam formed at the intersection of two adjacent metal sheets by folding one edge over on top of itself and the folding the other down under itself and then locking the panels together
a method of interlocking metal panels in which one panel edge is folded back on top of itself and the other panel is folded under, after which the two panels are hooked together