These 1" hose clamps are dated 3/64 and are N.O.S. surplus from a Ford assembly plant.  Sold as a set of 4.  For 1" OD hose.  Ask about large quantity discounts.  

This information was sent by a helpful eBayer purchaser: Just wanted to let you know that these clamps work well on 5/8 heater hose on chevrolet and other GM cars & trucks 68-72.

They are a snug fit so are a little smaller then the original size which you cant get any more.
The repro clamps others sell are the same size for 5/8 & 3/4 making the 5/8 a sloppy fit and prone to leak.

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