These are new old stock vintage parlor guitar tuning machines made almost 50 years ago for the production of Cremona cooperative in Schonbach (Luby), Czechoslovakia. They are in great shape (as they have never been used before and stored in a warehouse for the whole period) and will work great for both slotted and plain headstocks, please see measurements in the picture. They will be great for relicing purposes too, since they are nickel plated. The price is for one pair (left+right).