Forrest says the Square-Top Woodworker II blades can create an absolute 90º square bottom groove with no scratches or score marks. The 1/8-in. kerf blade cuts a 1/8-in. groove and its 3/32-in. kerf blade cuts a 1/10-in. groove. The blades have a 10-in. diameter, 40 teeth and a 5/8-in. bore.