The kife cleaner is made of wood and leather.
Two rectangles of wood are hinged together with a piece of leather tacked to the inside of each piece. One side has a handle shaped from it and a thin plywood cover over a hole through to the leather. The hole is possibly for a container to apply lubricant. Crudely made.
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handle 70 x (13<28) x 15mm
Courtesy of Waikato Museum Te Whare Taonga o Waikato