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Hex head, 7/16" - 20 UNF cylinder base nut, polished stainless. S&S stainless steel base nuts for Shovelhead engines in 1936 - '84 Harley-Davidson big twin models. 7/16" Hex allows the use of box end wrench to tighten base nuts on S&S Sidewinder cylinders for shovelhead engines. Requires .375" - .400" stud engagement - stud height may need to be adjusted. 100% Made in America. Part #93-3063-S. Sold Individually.