This set includes 3 superior quality spiral upcut router bits made from premium solid micro-grain carbide. For use on soft & hard woods, ply-woods, composites, laminates, plastics and some non-ferrous metals. Ideal for grooving, dado cuts and mortise and tenon joints. Can also be used for slotting. • bit 1: shank - 1/4", cutting diameter - 1/4", cutter height - 1", overall height - 2-1/2" • bit 2: shank - 1/2", cutting diameter - 3/8", cutter height - 1-1/8", Overall height - 3" • bit 3: shank - 1/2", cutting diameter - 1/2", cutter height - 1-3/8", Overall height - 3" Bits produce fast, clean and accurate cuts and will stay sharper longer. Upcut spiral provides for excellent chip removal pulling chips up and away from your work towards the router.