Fastener Length - plastic knob

A home owner from lancaster, pa. says:
the fastener I have is 41/2" long. It's for a 13/4" bi-fold door. How long is the fastner that comes with this knob?
Thank you
Tom
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Paul from SWISCO responded:
The knob fastener for the 22-012 is 1-3/4" long.
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