As said earlier, consider making a first cut so that the by-shine rubber is cut according to your saw. Then, performing a second cutting operation to check whether the cut is straight. I have a cut flatness problem with two rules. The cut is not straight, it will eventually curve, and that using rules or separately placed end to bout.Produit convenient to store and transport. Plastic and resistant and does not slide rule once established. By cons length is only 70 cm in total, may be short for certain uses.