Hand made in Japan by Michihamono with a blue paper steel cutting edge, the Obisuki is designed to cut trenches and borders in leather. This can be in preparation for folding, joining or further thinning. 

It's two outside "teeth" first cut the outside edges of the trench, which is then cut by the extremely sharp cutting edge that bridges the two.

Dimensions:
Overall Length: 140mm
Blade Length: 40mm
Handle Length: 100mm
Overall Cut Width: 14mm
Internal Cut Width: 12mm