The round floppy head ratchets are nice because you can swing it out and use it like a nut driver.

The ones crenwelge posted about have a locking feature, here's the english version of the page he linked
http://www-de.wera.de/zyklop.html?&no_cache=1&L=1

This is the one I have that's sort of similar, I hate the split beam, makes it feel weak as it flexes (not a problem with the Wera)
http://store.snapon.com/Round-Head-...ivel-Head-Soft-Grip-12-1-2--P648544.aspx

In any case I don't think this round head sort of ratchet is a one and only tool, they have good uses but you'll probably want other ratchets in your kit.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-