All-steel, cheapest Shimano front derailleur you can get. Tourney TZ500 is down-swing, dual pull, clamp type and meant to be used with 42-34-22T crankset. Shimano site says its compatible for 8 and 7 speed, but included in a groupset with 6 speed rear derailleurs, so I assume it’s also 6 speed compatible.
There is also a TZ510 model, which is compatible with 42T cranksets. Only for 3 speed chainrings. It’s also specially denoted as to be compatible for friction shifters, I don’t know why and it also doesn’t make any sense, as any Shimano derailleur have no indexing built-in on derailleur. So, index shifters should also work logically.
Despite being dinky, it’s also very lightweight. However, the cage is low carbon steel, so it’ll probably bent if you have a serious mis-shift problem.