Here is the first thing to look at when you're starting your Snap-On collection.

Its a 100 tooth ratchet with an adjustable head, and a long shank.

The 100 teeth mean that you will get a "click" in tight spaces were ratchets with less teeth will no "click".

When I was installing the Viair compressor mounted to the JK's break booster, this was the only ratchet that I could get into the work space, AND click.

and where other ratchets (none cheap) would not have the space to cycle this ratchet clicked 3 or 4 times. Its a MUST have.