These types of locks are common in vending machines. There are however used in many other applications. T-handle locks are very easy to replace since you pull out the T-handle lock when you open the device. To complete a T-handle lock upgrade, you just need to place the new lock back when you are closing the device. T-handle locks come in 2 variants namely a spring latch allowing devices to be re-locked without using a key and a dead latch which requires a key when re-locking a device.