The Stanley Fatmax Tape Measure features an Auto-Lock Mode for excellent control and longer blade life. The tape measure also has a manual mode to for speed marking. The detachable hook allows the user to work efficiently in different applications. The patented BladeArmor offers 10 times longer blade life. The tether ready hole enables the user to attach a tool lanyard when working at heights (lanyard not included). The Mylar film on the blade prolongs extends the life.