Thumbnail Filmstrip of Black Rubber Tuning Wrench for Harp Pins Images
This tuning wrench will work for most folk harp, lever harp, and celtic harps.
If you are unsure, you can measure the head of your tuning pin. Use a digital caliper and measure the width across the top of the head. This wrench will work if the the measurement is between .176" and .185"
This wrench works best with tapered harp pins. It will work for threaded harp pins but will be a little loose.
If you know you have threaded harp pins, you should get this wrench. All current Musicmakers harps have threaded harp pins.
If you don't know if you have threaded harp pins or tapered harp pins - check out this article.