Groover for thick leather 5 in 1

I developed this tool for thick leather, this tool come from a shoe smith who custom it. 

The construction of this tool is very convenient for thick leather, I think it is useful for all leather smithes.

There are 5 heads for you, 4 for groover and 1 for line making, the 4 groover sizes are: 1.0mm   1.2mm   1.5mm   2.0mm, you can easily change the heads.

The handle is Courbaril and Rosewood or other cherish woods.