Plug / Tenon Cutter 1/2″ Plug Diameter 22.70mm Outside Diameter 57mm Plug Length 1/2″ Shank Diameter 90mm Overall Length 4 Teeth. Dimar’s Plug Cutters are an excellent choice to produce perfect matching plugs for several of our Bormax Forstner Bits. In simple terms, a TENON is a projecting member left by cutting away the wood around it and made to insert into a matching mortise to secure the parts together. DIMAR’s Plug Cutters Tenon makers and Bormax Forstner Bits are premium quality tools Made in Germany. They will produce precise rods from a wide variety of timbers.