Clean alder except for a small...
Single action compression truss rod with stainless steel adjustment nut. Available with your choice of slotted heel or top (headstock) adjustment 5/32" (4mm) hex nut for guitar or bass.
Stainless steel adjustment nut. 3/8" outer diameter, 10-32 thread, 7/8" overall length. $4.45
Linear carbon fiber for maximum rigidity.