... 1220/1560/1820/2100/Any Width within 2100mm Standard Length(mm) Any Length over 600/Need Cut again within 600mm Color ... soundproof. 7. Convenience for transportation and construction Light weight, standard size, convenient transportation & construction, easy cutting and punching, ... 5 times larger than the diameter of the screw. Do not tighten the screw strongly, otherwise stress will arise, and ...