Universal design 
1 inch steel ball bearing roller
Steel inner race with 1/4 inch hole
Center groove.
Sold Each

Diameter: 1-inch
Material: Steel
Roller Diameter: 1-inch
Roller Edge Type: Concave
Roller Material: Steel
Roller Width: 5/16-inch
Type: Concave
Width: 5/16-inch

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13206 - Steel Wheel
13227 - Nylon Wheel