| http://www.w3.org/ns/prov#value | - such things as plywood as they are only a few mm high and any wood higher would simply flip over the tops of them.It opens quite wide, and together with the fact that you can move the plastic studs around the top, popping them into any of the many holes, it can grips several different sizes of wood and the like.Then there is the rubber stoppers which are on the four feet which really do help this
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