Marked "8110" these are all just under 7 inches long. (180 mm)
The blade portions seem near full length compared to my beloved Marples with Ash handles.
The clever engineering is in the handle, which is Pear shaped.
Behind the bolster, the neck of the handle has a conical taper.
The last third is a full 5 1/2" diameter, with a large flat aligned with the blade. (140 mm)
This isn't just to keep the chisels from rolling off the bench - it gives tactile feedback to the orientation of the cutting edge. The aligned flat came as a surprise - something obvious I had overlooked.
It's another of those "Why didn't I think of that?" moments.
I got them because of the cost (set of 4 delivered for less than $60 usd) and find them an excellent tool, because of the overall size and doorknob sized handles.
http://imgur.com/gallery/jpRbzes