Chiave a brugola Musiclily Pro in acciaio temprato da 9/64 pollici per regolazione del truss rod di chitarra e basso.

These seem pretty good. They fit well and are long enough to reach into the truss rod hole of an American Stratocaster (1/8") and an Import Squier (4mm). They sit high enough to not impact the surrounding plug. They appear well made. Very very light though and it's hard to tell how much torque these would take without breaking. Theoretically you shouldn't be putting that much pressure on them anyway.The nice thing is if you were to break the allen wrench part, you can still use the handle with a replacement allen key. I like that you can adjust the length into the handle if needed. Keep in mind these don't come with the little hex key needed to do this so you'll need your own.It would be nice if they came in some sort of case, even if it was minimal and cheap.