Precision ground, hardened high carbon steel. Fine pitch spiral pulls auger into workpiece and single spur slices timber ahead of the cutting edge, producing accurate holes. Use in all SDS Plus with hammer set to ‘Stop’. Precision ground, hardened high carbon steel. Fine pitch spiral pulls auger into workpiece and single spur slices timber ahead of the cutting edge, producing accurate holes. Use in all SDS Plus with hammer set to ‘Stop’.