1/4-20 1" Long Titanium Socket Head Cap Screws are anodized blue and used in most slotted control arms to lock the adjuster mechanism in place. If your SPL Parts control arm has a jam nut, this part should not be needed.
Application List:
SPL RUA S13
SPL RTR S13
SPL RTR Z33
SPL RTR Z34
SPL FUA Z34
SPL RTA Z33
SPL RTA Z34
SPL RLL Z33
SPL RLL Z34
SPL FUA R35
SPL RLL R35
SPL RTA R35
SPL FLCA FRS
SPL LCA 996
SPL RLCA 986
SPL FLCA E9X
SPL FLCAR E9X
SPL FLCA F8X