spiral for sliding window - 28" x 5/8" diam red head

A home owner from Miami Beach, FL says:
I would need four units. The window sash is not more than 20 lb. and is non-tilt. The current spiral head is red. It is a vertical window with one spiral in each side
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Paul from SWISCO responded:
Based on your information, I would consider our Series 500 spiral balance.
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