I didn’t have any wooden screw clamps, so I pick up a couple 12″ kits from Jorgensen and built my own. Very functional build and a little cheaper than buying them completed. The instructions were very clear, but a little difficult to read. In other words, the information is all there, it’s just a little jumbled. The core is made from 2 pieces of 3/4″ Baltic Birch Plywood and the sides are made from what I think is Cherry.