here's a comparison picture for scale - a tyzack bench chisel - i can't remember the size - 1/2-5/8" or so with a bit of its length used up. Size wise, they're not quite the heft of a timber framing chisel - but they're tubby up at the shoulder = 3/8" thick at the tang and then tapering down after the shoulder and about 1/8" thick at the end. That keeps them from being too bulky to use, but the stiff shoulder helps make them robust. You can hit them as hard as you can swing anything that won't break off the beech handles, but they excel since they're the length overall of an english chisel being kind of a pusher and hatchet type or shaping wood before final stuff.
