Guyker 8-hole Truss Rod Bar - Nut Rear Steel Dual Way Trussrod Acting for Electric Guitars Bass 440mm Luthier Tool

Part of guitar setup is truss rod adjustment to make the neck straight. 

Features:
Guitar truss rod.
Total length is 440mm rod for making or repairs.
Made of high quality of steel.
Fast and easy to operate.
For all instrument types.
A must-have tool for pro luthier shops and home shops alike.

Note:
Please allow 1-2mm error duo to manual measurement.