Billetpro 20B 1/2″ UNC stud kit.
Kit includes: 16-1/2″ long studs, 2-13B length studs & 2-short length studs with 18-O-rings and ARP nuts & washers, 2-M10 studs with ARP 3/8″ nuts and dowdy washers. Allen key end for easy install and removal.