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These collets are BSA part number 65-1624
They are machined on a CNC Swiss lathe from EN24T high tensile steel.
Vey good fit on the valve collars and valves.
Price is for a pair of collets. I.e. for one valve.
For a complete cylinder head you need to order 4 pairs.
They are made in small batches, which accounts for the price being what it is.