HELPS KEEP dust and debris out of your carb FITS Holley, Edelbrock, AFB, Carter, & Quadrajet carburetors SPECIFICATIONS: 5-1/8 “ Diameter Neck CONSTRUCTED FROM bright yellow, high-impact molded plastic INCLUDES 1/4"-20 stud and thumb screw Carburetor CapHolley, AFB, QuadrajetFits 5-1/8" Diameter Neck