510mm rotary trimmer with self sharpening blades totally enclosed in a plastic housing automatic see-through paper clamp steel pre-printed cutting table base adjustable backstop and scale bar calibrated in inches and centimetres. The Dahle 552 Professional Rotary Trimmer with a 20" cut length is designed for precision and accuracy. It features a ground self-sharpening blade that cuts in both directions, a Dual-barrel guide bar for strength, and an automatic clamp to prevent shifting. This German engineered cutter is ultra-precise and ideal for trimming paper, photos, and cardstock.