A useful specification does not need to assume unknown values. It simply gives the purchasing discussion a clear starting point.
Start with the profile reference.
Use the closest drawing, section image or physical sample reference. It helps identify the intended visible geometry and application context.
Add the finish direction.
A finish sample, material image or target surface reference can establish what needs to be reviewed. Coating information is available on request where applicable.
Give the order context.
Estimated quantities, intended lengths, packing expectations and destination help shape the enquiry. MOQ and lead time remain available on request.