1-7/16 inch diameter nylon non-ball bearing wheel with adjustable steel housing.

Snap-in bracket for steel framed, panel jacket doors.
Markings: Acme 4011.

Mount: Bottom Roller
Bracket Color: Mill
Height: 3-3/8-inch
Wheel Diameter: 1-7/16-inch
Wheel Material: Nylon
Roller Edge Type: Flat Convexed 
Roller Width: 5/16" reduced to 1/8 inch 
Priced and sold Each

Related items:

25143 - Bottom Roller, Concave Wheel
25157 - Bottom Roller, Convex Wheel
25112 - Top Roller, Single wheel

NOTE: Acme had the 4011 / 4012 number stamped on the bracket. 
However, the wheels may have been different. Please Compare all measurements