http://tinyurl.com/oo3czfgByrd Tool Shelix cutterhead for Dewalt planer DW735Product Review Click on the link for more reviewsSpiralled Stagger Tooth- to break up chips fpr dust collectionShear- to give clean cutting action Helix to assist the chip flow2.5mm thick knives (Most are 1.5mm)Extremely quiet cut Greatly reduced tearoutrotate cutters when dull Replace only 2-3 cutters if they hit steel