measurements of items 21-214 and 23-024

A quick learner from lexington, ky says:
can you give me the specific measurements of these two items especially the plastic roller?
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Paul from SWISCO responded:
Sure. The 23-024 uses a 7/8" convex nylon wheel and the 21-214 uses a 9/16" wheel at the top with a 3/8" shaft with a height of 7/16".
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