TUNGSTEN CARBIDE TIPPED, BEARING GUIDED 1/2? STRAIGHT ROUTER BIT FOR USE WITH MILESCRAFT DOOR MORTISE KITSFeatures Tungsten Carbide Tipped for long-lasting durability Bearing guided bit eliminates the need for guide bushings 1/4? shank fits most collets 1/2? straight for mortising and other router projects For use with Milescraft? mortising kits as well as other brands