CARL, CC-10, Handheld Paper Trimmer, rotating head offers 5 locking preset positions to provide optimum pressure on the materials youre trimming. Sleek, ergonomically-designed handle can be used with either right or left hand. Thumb-activated retractable safety cover helps prevent injury during trimming. Quick-change blade axle with automatic blade tensioner makes it easy to change or replace cutting blades. While this trimmer includes a straight blade, there are 10 other blade designs that are sold separately.