This is a standard zither pin commonly found on a variety of harps, autoharps, hammered dulcimers, psalteries, and a wide variety of old zithers. If you are looking for a replacement zither pin for this type of instrument - this is likely the pin you are looking for.
These zither pins are 1-3/4" long and fit a 3/16 inch (5mm) diameter hole. Both our Clock Key and our L-handle Tuning Wrench will work with these pins.
The zither pin with enlarged hole has a hole that is large enough to accept a .055" and .060" nylon harp string.