Capitol 930 Patio Door Roller 1 inch Steel Wheel With Steel Housing Sliding Patio Door Roller

Capitol 930 Series Patio sliding Door Roller Assembly, Flat 1inch Diameter Steel Wheel. 
Used on old capitol doors, maybe the 930 series. 

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1 inch flat steel ball bearing roller unit
Adjustable steel housing assembly

Diameter: 1-inch
Housing Tab Style: Plain Back
Housing Width: 19/32-inch
Material: Steel
Roller Diameter: 1-inch
Roller Edge Type: Flat
Roller Material: Steel
Roller Width: 5/16-inch
Type: Flat
Width: 19/32-inch

Helpful Article:How to Replace Rollers in an Aluminum Sliding Glass Door