Hi Bob,

...it is 6.25''
any other dimensions you need, feel free to ask...

John

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Hi,
Do you have more information about the Geared Kolm in your picture

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Hello,
I am the designer/ builder and I am working in collaboration with Kolm to produce these reductions. I will have all performance data and tech info available after testing the protoytpe in the next few weeks.
Look to my dossier here for the updates...

Best regards,
John