Coroplast is also known as corrugated plastic or corflute.
2.5mm – thin coroplast is primarily for bus bench printing where the coroplast sign needs to fit in a tight frame.
4mm – the most common thickness for yard signs as it works perfectly with wire H stands and grommets. 4 mm coroplast signs are the standard choice for most applications.
6mm – heavier coroplast signs are often preferred for sandwich boards or signs exposed to more severe weather conditions. Wire H stands do not work with 6mm corrugated plastic.
If selected, a hole is punched in the coroplast sign and lined with a metal grommet. Grommets can be place on just the top corners, or all corners of the coroplast sign, and as is often the choice or realtors, an anchor grommet may be added to the left side.
This fifth grommet is used to connect the sign to the signpost to keep it from swinging in the wind.