1/4" x 4-1/4" drill bit with cobalt and tungsten carbide tip for exceptional performance when drilling in concrete, marble, tile, plaster and other masonry materials. For rotary or percussion drilling - can be used in cordless or corded drills or drill presses.

Special negative back grinding enables the tip to bore through materials with a filing action rather than a cutting action. No center punch required; eliminates "walking". Can be resharpened on a high-quality grinding wheel. Made from chrome vanadium steel for the maximum blend of flexibility and hardness.

For rotary or percussion drilling. Can be used in cordless or corded drills or drill presses.

Perfect for installing 5/16" fasteners up to 1-1/4".SKU: D6-25Y $3.79