Here we have a Set of (2) Period Correct Chrome Accessory Battery Hold Down Knobs.They are absolutely Beautiful.Vintage Chrome,not like the newer chrome that flakes off when you tighten them up.I figure these were made in the Late 60`s - Early 70`s.They measure 1.700" wide and the cap is about .500" tall.The entire cap is .865" tall.The thread is 5/16 X 18.They will fit Big Twin Flathead Knucklehead Panhead Models.What a Great Way to make your Vintage Ride stand out.Change your wing nuts and go.They each come with a stud and washer too.Free USA Shipping,(International Rates Still Apply).(Sorry about that).Thanks for looking.