Delta 12" x 5.9" portable planer model 22-540 type 2, 15A 8000 rpm. 3 bolts holding blades are smaller than others, so some uses 5/16" wrench and 3 use smaller wrench. Bolts turn clockwise to loosen. Tighten bolts to loosen blades. Extra blades are available. Use alignment tool to reset blades.