These tools are Steel edge creasors, they were used to create "pressed effect" and draw sewing groover, please look at the pictures carefully you will see they were very useful.
LZpattern develops those tools.
There are 4 different sizes, double heads, two function, so save money a lot.
2mm, 3mm, 4mm, 5mm you can choose or a whole kit.
1. You can wrap leather strip or flax to add friction. We will gift you some flax
2. If you heat the head a little by an alcohol burner before using, the effect will be better.
3. Wet the leather and use it will be better.
4. Take care with you use a flaming alcohol burner!!
You can buy the alcohol lamp here: