Plug / Tenon Cutter 1 1/8″ Plug Diameter 40mm Outside Diameter 57mm Plug Length 13mm Shank Diameter 90mm Overall Length 5Teeth. 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.