Ergonomically styled, suitable for right and left hand use. Comfortable soft grip handle and safety locking system. Rotary cutter blade stays upright after use, and sits perfectly in the cutting position at all times. Innovative blade guard system lifts out of the way when cutting, but drops back to protect the blade after use. Higher quality hardened blade has a longer life and always provides a supersharp cutting experience. Easy replacement blades (#3902145 or 3902146).