The Foos wood carving set is 4 pieces total, solid carbide, 1/4” shank router bits. A 20° profile bit for etching and outlining. A 15° carving liner for fine details. A 60° bit for background effects. Last but not least, this set includes the popular Tapered Angle Ball Nose cutting bit with a 1mm radius tip. Solid, Premium carbide capable of cutting many materials including aluminum and MDF.