Used to replace rollers that are 1-1/2 inch diameter 1-1/2 inch concave roller Can be mounted using a rivet, a roll pin, drive pin, binder post and screw or bolt and nut to install the roller in place Steel ball bearing wheel Contains 2 steel ball bearing wheels, 2 axle pins, 2 roll pins, 2 carriage bolts with nuts, 2 rivet axels and 2 binder posts with #8-32 x 1/2 inch screws Please refer to the line art drawing for dimensions and compare with your needs before ordering