80-105 details

A quick learner from USA says:
1.) Looking at Part # 80-105. Is this aluminum? Vinyl?
2.) What's the difference between parts 81-018 and 81-149? Is it just that 81-149 is stainless steel?


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Tom from SWISCO responded:
The 80-105 sliding glass door replacement track is extruded aluminum. As for the 81-018 and 81-149, the only difference is just as you said: the 81-149 is stainless steel, while the 81-018 is not.
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