Don’t you just hate it when you pull out the tape to measure and before you get a chance to read it, it slides back into the case? Komelon has solved your dilemma. There is no need to slide the lock button to maintain the blade position. The patented self-lock feature keeps the blade at whatever length you pull out until you hit the retract button. This self-lock feature comes in 16`, 25` and 30` tape measures. Imported.