Reproduction Wingnut. Used on all 1/4″-20UNC Air Cleaner to Carburetor Studs and 60-69 Battery Hold Down 1/4″-20UNC J-Bolts. Will NOT fit the Larger Sized Battery Hold Down J-bolts-Studs used on the 60-64 C-Bodys. Stamped from Heavy Gauge Steel and Zinc Plated for Proper Appearance and a Lasting Shine like the Originals. Made to OEM standards for quality and fit.