These look ridiculously good. Not familiar brand, but I am curious what their warranty process is.
Judging by how easily brass drifts get damaged/worn, I think these brass hammers will be a wear item. Local warranty may end up being a factor.
Certainly a valid concern when relying on it every day in a shop.
I first found out about them via the South Main Auto Youtube channel. They sent Eric O a few (maybe a complete set of hammers and drifts? I can't remember).