valtsitud lehtmetall paksusega üdjuhul kuni 6,5 mm (1/4 tolli), teraspleki puhul kuni 3,5 mm (vt plekk; vrd paksplekk), any material or piece of uniform thickness of up to 6.5 mm (1/4 inch) and of considerable length and width as compared to thickness; occasionally, for sheet steel the limiting thickness is 3.42 mm (0.