When I got the front blade for my Craftsman, Sears was selling two different models. One was for snow only (rather lightweight), and one was for snow/dirt/gravel. I got the heavier of the two, mostly concerned about longevity. It worked well in snow (with 55# wheel weights and chains). I was able to move loose dirt and gravel, but could not budge packed dirt.
It raises and lowers using the same lever that moves my mowing deck up and down.
A word of advice if you pick up a used one: see if you can get the manual with it, or pick one up from Sears. There are some parts that you install on the tractor, and leave there even when the blade is removed for mowing season. You may not get these parts with yur used blade. You can order them from Sears, or get some of them made... they're pretty simple, if I recall.
John Mc