Most of the accessories for workbenches, such as holdfast clamps, bench dogs and other accessories that you will find on the market are for use with holes of 19mm diameter. 

If you want to make your own homemade accessories, you must make the holes in the diameter of the steel rod you are going to use. In the case of my homemade bech and accessories, 20mm.


If you’re going to use OSB board, do check the thickness of each board. Sometimes it varies a little, and can affect the functioning of mortise and tenon joints.

The most important thing is that the middle piece of each frame part is the same thickness. I had to use the jointer to even out the thickness of some pieces.