OEM equivalent: STANDARD SAE THREAD CHECKER;EACH SIZE HAS A NUT AND BOLT CHECKER.;EACH GAUGE ROTATES FREELY ON THE WIRE CABLE;AND IS PERMANENTLY STAMPED WITH SIZE.;14 INCH SIZES: 6-32,8-32,10-32,10-24,1/4-28,1/4-20,5/16-24,;5/16-18,3/8-24,3/8-16,7/16-20,7/16-14,1/2-20,1/2-13. Original Equipment Manufacturer (OEM) Part Numbers are given as a reference tool only.