HD-sized pocket-hole cutter bit works with the special drill guide block (sold separately) to create plugs that perfectly match your project.This specially designed bit chucks into any drill, and fits into the hardened-steel drill guide in the Kreg Custom Plug Cutter System (sold separately)Positive stop collar ensures perfect drilling depth to produce accurately sized plugsOpen design and enlarged inside diameter provide clearance around plug for easier drillingSpecial fluting reduces heat and friction for better plugs and longer bit lifeMulti-tooth cutting tip shears cleanly to produce smooth, consistent plugs