SINGLE END, NANO/3 COATED 20 DEG PER SIDE TAPERED ENGRAVER, .020 DIA BALL, 2 FLUTE HIGH PERFORMANCE HELIX, 1/4 SHANK, 2.5 OAL Lakeshore Carbides unique spiral helix geometry allows this solid carbide engraving tool to cut faster and last longer than the engravers you have previously used. Proudly made in the USA.