Starrett S011 ProSite Hidden Edge Utility Knife
The Starrett ProSite Hidden Edge Utility Knife is an innovative knife that keeps the blade safely tucked away when not in use, yet is instantly available by simply releasing the lever to the knife body.  The cutting depth is easily and accurately adjusted with a thumbwheel.  With quick release blade change and storage for spares in the lever, blade changes are fast, safe, and tool-free - you do not have to take this knife apart to change the blade.