Whats the best way to cut a small heatsink?

So I just purchased 125 of these old northbridge heatsinks that look similar to this one, only they are black. I've never messed with metalworking before so I have no idea how I'd go about cutting off the ends of some of these (the two tabs).

These aren't the copper $7-15 heatsinks with really high surface area, but my plan is to use these for all sorts of mosfets and anything that gets hot that is not normally cooled.

Aviation snip should do the job then grind the sharp ends or use a dremel.

A good pair of diagonal cutters. Or Maybe snap them with some pliers and then debured them with a small file. A points file should do.

A band saw would work wonders.

A good pair of dikes as turd said works well, but leaves very rough edges. If you have a dremel handy use that to cut and sand the sinks down. You'll need a bench vice.

A simple way I have cut them is to hold the sink in a bench vice and cut the section I need with a hack saw. After you cut them you can use a file to clean up the cut side.

Just use a dremel with cutting wheel. It will work perfectly and easily.