Leather thinning device, leather splitter, KL4361 | Leather Craft Tools and Accessories

Used for thinning or splitting leather. 

.. and what's important - you can use standard box knife blades sold in any hardware store.

The thickness of the part to be cut can be adjusted. Attach to a sufficiently strong workbench. If your work requires more pulling force, fix it properly using long screws or a clamp.

A short introduction HERE and HERE