Does package includeds 1 set per window?

A contractor from Roseville, CA says:
September 5, 2010
Product Code: 87-180 This sliding window roller assembly is used on Merzon brand windows. It features nylon housing with two 3/8" diameter brass concave wheels. Does package includeds 1 set per window?
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Casey from SWISCO responded:
September 6, 2010
This tandem style roller is designed for heavy dual glazed windows or the housing may be separated into two separate assemblies for lightweight windows. It is sold as shown in the product image.
A contractor from Roseville says:
September 7, 2010
Hello Donna, I believe in an indirect way, you are answering the question! Your company sells them as singles and I need to order 2 each per window. And you are doing this just in case a window is light weight, then we can save money by cutting them in half and using one half at each end. Correct?
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Paul from SWISCO responded:
September 10, 2010
If your window is heavy you will need to order (2) 87-180 rollers. If your window is lightweight, you can order (1) 87-180 and split the housing to create two rollers for your lightweight window.
Merzon Sliding Window Roller, 3/8" Concave Wheels
Merzon Sliding Window Roller, 3/8" Concave Wheels
87-180
$4.37
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