Here's a genuine one as a good luck charm. (4380 yen at Soundhouse) Sizes: 1/2 inch and 9/16 inch This one came with a Galaxy set, but I think the 1/2 inch one can tune almost all LP bongos, congas, and timbales. If the inch size matches, it should work for instruments other than LP as well, but please check the size of your instrument. The 9/16 inch one is for the Galaxy series congas, and you probably won't use this size much unless you have a higher-grade model. You might be able to turn the 1/2 inch with a 13mm wrench, but I think using the correct size is important for taking good care of your instrument. If you're particular and want the genuine one, this is it. This product has rounded tips, so it's gentle on the instruments you use it with. The rubber grip is also a thoughtful design.