Veritas Dowel Former, Insert, 12 mm

This dowel former allows you to make dowels of any length as you need them. You simply drive an oversized piece of wood through the sharp-edged hole of the solid A2 tool steel insert to shear excess material from the dowels. 
The 3" diameter mounting plate (which can be used over a 3/4" or 20mm dog hole) has two screw holes for permanent mounting; the interchangeable inserts snap into it securely.
Individual inserts can be purchased separately; the mounting plate, also sold separately, is compatible with all metric and Imperial sizes.