This is a standard Holley Carburetor main jet kit, with thread sizes of 1/4 "-32 and jet hole sizes of 50,51,52,53,54,55,56,57,58,59.The product has engraved numbers to distinguish it. The quantity for each size is 2 pieces. You can get a total of 20 pieces.Made of brass and processed by CNC centers, the cumulative sales have exceeded tens of thousands of sets, and the product quality is trustworthy!. 1/4"-32 UNF Unified Fine Thread.
