These go together relatively quickly.  We have used them on numerous projects, we have the 225, and x2 425's.  They come in very hand and are extremely versatile.  The rear board comes off or can be re-located to meet your needs, the feet fold under and there are shorter feet in each corner with then replace the folded feet.  A small roll pin holds on the handles.  As long as you don't need to remove them a simple hammer and the included plastic "wrench" is all you will need to assembly the tables.  The edges (facing each other) are grooved).  The idea is to help hold material.  Another vertical groove is included to allow you to put in a round object and fit in the vertical groove (about 1/4" deep).  With a couple quick lever release/catches this will fold flat.  While this is mostly just stamped steel with some plastic guides and the ??bamboo?? top its a very nice quality work bench.  One thing I will mention with this is the second 425 I purchased had a slightly chipped wood work surface on one of the 3 pieces.  Not a big deal, but wanted to mention it.