Planer HL 850 E-F-PlusSingle knife cutter head with spiral design with replaceable cutting knife for a smooth, quiet and chatter free cut. Multiple head options to create rustic architectural effects in beams and flooring. Unlimited rabbeting depth with flush cutter side design and retractable spring loaded guard. Rotary handle depth adjustment allows precise depth setting to 1 256" (1 10 mm) up to 9 64" (3. 5 mm).