Draper expert 13mm rosehead countersink bit hss 8mm shank draper expert 19234 expert quality manufactured from high speed steel hardened and tempered to 55hrc for long life the 90176 head incorporates five cutting edges and an 8mm diameter shank suitable for use with hand or power drills on hard or softwood metals and plastics display packed draper expert 19234 13mm rosehead countersink bit hss 8mm shank