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81-160 Tandem Glass Door Roller, 1-1/2" Concave Plastic BB

Do the plastic roller's have the same weight rating as the metal rollers? My doors older rollers are metal and the 81-160 design matches them. Thank you!

Stamped on side: Product of Del Mar Eng. Co Long Beach Cal Pat 3 670.357 L 3 1/8" X W 5/8" (6/8" w flair tab) X H 1 1/8" (w tab 1 3/8") Screw tab only = 5/16" Hoping to replace these wheels. Need total of 6 components

Can you please help identify this part and either identify the part or a replacement that will substitute for it?

What I bought from you vs what I need is the larger one in aluminum Do you have these ??

3/4" x 3-3/16"x 1-1/8" high . wheels are 1-1/2" diameter.ThanksCarlos

Information printed on roller : WB-32N and S & S Wheel outside diameter: 1 1/4" Tape measure length is 3 1/16" pls advise if u can help with replacement part information.

We ordered 81-168 Tandem Roller Assembly, SS Wheels, but they are too wide. We need them to fit large Fleetwood sliding doors manufactured in 1983. The channel width is about 5/8". Do you have such units?

Del Mar Eng Co. Pat 3,670,357 wheels have Kilian Toronto Can. & Syracuse N.Y. wheel is 1 1/2 wide, 3/8 thick! the bracket 3 1/4 long and up and down 1 1/8 inch's thick 5/8, all way out its 4 3/8 long wheel to end bracket, I need 4 double wheels for two double pain glass sliding doors! if th ... (cont.)