1/2" Overall Diameter x 1-1/4" Carbide Height Panel Pilot Bit, 1/2" Shank, Double Flute, 3-3/4" Overall Length, Drill through Point Allows Self Starting & The Pilot Acts As A Guide, Cuts All Composition Materials, Paneling, Siding, Plywoods, Hardwoods & Softwoods, Use On Portable Routers For Template Work.