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81-052 Sliding Door Tandem Roller Assembly

We are trying to replace a "Del Mar Eng, Long Beach, CA tandem roller. It has identical dimensions to Swisco #81-052, so we bought two assys from you. However, two differences prevent using your assys. 1) see photos of original -yours has countersunk and threaded mounting holes on top; the origi ... (cont.)

I have a P.E. Del Mar part number for the Tendem rollers I need , but I can't order from them since I'm located in Canada . I was wondering if Swisco could help me out with this situation. The P.E. Del Mar part# is 4240 and 4266 they are the same but with different part #.I would need 4 tendem rol ... (cont.)

Hello! We want to request the Rating or capacity of the roller assembly of your 81-052. Thank you, Gus

What is the size of these wheels? I have a product stamped with Del Mar Eng Co that looks identical to this. Will it work?

This is the roller assembly for my sliding glass door. I looked all over Home Depot for the replacement and cannot find it. It is fairly large.

will your 81-052 wheels fit a pella 8ft. sliding patio door. also door handles.