
This is a white plastic housing with concave tandem steel rollers. Used by A.B.C. windows. Dual wheel upgrade to the Prime-Line part G-3038 improves glide and window performance. •Used by A.B.C. windows •Tandem concave rollers that can be used for flat rollers as well •5/16 inch diameter rollers •White nylon housing and steel rollers •2-pack
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