Used with frame rails 10-011 (63-81 Corvette 4-link rails) The S W laser link features the optimum in tuning adjustments, 144 possible instant centers. Also featured are laser cut frame and housing brackets with 5/8 holes for greater strength. The laser link features Heavy duty, 1″x.156″ wall links. Links are direct threaded 3/4-16L.H. on one end 3/4-16R.H. on the other and feature oversize hex nuts for quick, easy adjustments. Each laser link comes complete with grade 8 hardware. Rods end not included.