Expansion Swivel Key

This key is the best thought out design and works quite well.

The key has an actual thumb grip to prevent slippage during activations of the expansion screws.

The key was reinforced on the top and the bottoms

The key was put on a semi-circle built in swivel. Other designs allow the key to turn in a full 360 degrees and sometimes even comes off of the key itself. 

Made in Italy