The OLFA SK-8 is a larger, full size version of the SK-7. The SK-8 is a Heavy Duty Automatic Self-Retracting Safety Knife. It is an extra protection safety cutter featuring a blade that automatically retracts the instant it loses contact with material being cut, even when the blade slider is engaged. By simply reversing the way the blade fits into the blade slide, this knife can be used right or left handed. The contoured handle cushions your hand as you cut and is non-slip, even when wet.