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
#8 x 1-3/8" (typically contoured heel bodies use 2 standard 1-3/4" length and 2 shorter 1-3/8" length mounting screws) Sold Individually
#4 x 1-1/2" Long, Phillips head, Nickel, sold individually