WoodOwl | Plug Cutter & Countersink Set 12mmWoodOwl Plug Cutter & Countersink Set 12mm. Manufactured with the same precision and craftsmanship as all WoodOwl bits under the Star M brand, this set is also made using the same proprietary S55C steel. On a job and need a plug? This plug cutter is one of the only available that you can use a handheld drill with. Does not wander and creates a cylindrical plug which will hold better and in most cases you do not need glue.