This tuning key (wrench) fits harps with zither-style tuning pins, such as all the harps made by the Harpsicle® Harp Company (the Harpsicle®, Sharpsicle®, Flatsicle®, Fullsicle®, and Grandsicle®). This key has a plastic handle and a metal L-shaped shank.

Zither pins are tuning pins that do NOT go through both sides of the harp neck. (See photo.)