Jiayouy Pack of 2pcs 420mm Two Way Rod Type Guitar Truss Rod Steel with L- Wrench for Electric Acoustic Bass Guitars Neck Repair Adjustment Luthier Tool

I used this to replace the broken one a Canadian made Norman guitar. Pretty much worked perfectly.

Es justo el producto que anuncia!

Estuve buscando este tipo de Varillas y la verdad es que por el precio de una prácticamente me dieron 2, ya instalé una y funcionó perfectamente y me quedé con otra de repuesto además a pesar de ser enviadas desde Estados unidos llefaron en 3 días.

Two main complaints: one, the included adjustment hex wrenches are not the correct size to work with these rods (way too small). Secondly, and most importantly, these are NOT 2 way truss rods. Once you get them flat, any attempt to turn the rod further counterclockwise (to add relief) just results in unscrewing the hex nut from the end to f the rod - a true 2-way rod should adjust both ways (to reduce relief due to string tension and to add in more relief if the wood moves and/or lighter gauge strings are insufficient to maintain proper relief)!