I love this tension tool. Circular wrenches are superb in tight situations, using PICK GUNS, especially Electric, and of course RAKING. Like any variation, they're great for locks that demand an alternative. Add a spring into the mix and you've given yourself more options. Variety is the best weapon of the lock picker, and this professional variety will put you in charge of the situation. Give your skills the assistance they need to become better.
If you have chunky fingers or find standard tension tools a bit fiddly - this is your ANSWER!
By pressing the button at the top, the prongs move closer together, ensuring a snug fit, whatever the keyway size.