I bought mine a loooooong time ago, but I'm pretty sure they would've come from RS https://tinyurl.com/y2mrjpvb
Given what you've said, this might not be the tip for you, but if you want them to punch to a consistent depth, use an automatic centre punch rather than a hammer.
I bought mine a loooooong time ago, but I'm pretty sure they would've come from RS
https://tinyurl.com/y2mrjpvb
Given what you've said, this might not be the tip for you, but if you want them to punch to a consistent depth, use an automatic centre punch rather than a hammer.