I say "simple" because I don't know what these are really called and they aren't anything fancy. Just don't want anyone getting the wrong idea about this blog post. I'm going to show you how to make a set of chasing tools in a graduating range of sizes. I use these CONSTANTLY in my workshop. Hope you find this post useful.
First I got this inexpensive set of pin punches from Harbor Freight (Pin Punch Set 8 Pc Pittsburgh Item #93424)
They are four inches long, made of carbon steel with a black oxide finish to prevent corrosion, and have knurled handles for good grip. (Pin sizes: 1/16 in., 3/32 in., 1/8 in., 5/32 in., 3/16 in., 7/32 in., 1/4 in., 5/16 in.)
Then I use a large grinder to shape the ends...
Then used the belt sander to remove the razor edge top and to slightly round the corners...
And last, I buffed each piece with tripoli...
Tada! My own set of chasing tools for $7!
Here are some of the ways I've used these. It's really nice having just the right width of "line" tool for any particular small space I need to get into to stamp.
As well as my actual first and only attempt at repoussé.
Edited to add: I don't own those tools shown above. A community shop (lapidary club, junior college welding, etc) should have these tools. While I don't have the exact machinery shown in this blog (because I did in fact make these while taking a welding class at my local community college), I have made some at home on smaller scale equipment (very small) that I think a lot of metalsmiths have. Same tools... just smaller versions (grinder, sander, buffer).