Check the listing for details. Truss Rod Two Way Steel 18 inch adjustable 081209-S. Condition: New. Listed at 11.69 USD. Truss rod for guitar builders.Two way adjustable Rod is for inserting in neck while building. Similar to many OEM style rods. 18" overall lenrgth Specifications: 18" Length Two Way Adjustment 4mm Allen key head body is wrapped in blue shrink wrap to allow for gluing. Works very well for heel mounted nut, also can be used for headstock setup or tilt back headstock Requires: 1/4" wide slot 3/8" depth (approximate, actual is .369" allow for adjusting) Cut for nut area is 1.75" long by .425" (about 7/16" total top to bottom) Wrapped two way adjustable rod 18" overall length Single Rod In package We have drawings available for this application, please contact us for additional informationTruss rod for guitar builders.Two way adjustable Rod is for inserting in neck while building. Similar to many OEM style rods. 18" overall lenrgth Specifications: 18" Length Two Way Adjustment 4mm Allen key head body is wrapped in blue shrink wrap to allow for gluing. Works very well for heel mounted nut, also can be used for headstock setup or tilt back headstock Requires: 1/4" wide slot 3/8" depth (approximate, actual is .369" allow for adjusting) Cut for nut area is 1.75" long by .425" (about 7/16" total top to bottom) Wrapped two way adjustable rod 18" overall length Single Rod In package We have drawings available for this application, please contact us for additional information