Kennaframe Bi-Pass and Pocket door wheel / roller
3/4 inch Diameter Wheel
3/16 inch axle

Used with triangular bracket that supports 4 wheels. ( see 2nd Image)
Original had a brass inner bearing with nylon tire
Replacements are Special Order, custom made, all nylon, no inner bearing - White.

Sold as package of 4 rollers
Note: There is another one that uses a 15/16 diameter wheel, measure carefully.
Used with 25043 Hanger