Swivel knife
Encyclopedia
A swivel knife is a chisel-edged blade held upright and mounted on a pivot with a saddle for a finger. It is held somewhat like a pencil
Pencil
A pencil is a writing implement or art medium usually constructed of a narrow, solid pigment core inside a protective casing. The case prevents the core from breaking, and also from marking the user’s hand during use....

, but between the thumb
Thumb
The thumb is the first digit of the hand. When a person is standing in the medical anatomical position , the thumb is the lateral-most digit...

 and middle fingers, while the forefinger rides in the saddle above. It is used to outline and cut a design into the surface of leather
Leather
Leather is a durable and flexible material created via the tanning of putrescible animal rawhide and skin, primarily cattlehide. It can be produced through different manufacturing processes, ranging from cottage industry to heavy industry.-Forms:...

as an initial stage to tooling the leather with decorations.
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