High quality pressed steel 1/2" two bolt flange bearing. The bearing has a narrow inner ring with two set screws for attaching to the shaft. Bearing is pre-filled with grease.  

Diminisions:
Bore: 1/2"
Bolt hole to bolt hole: 2.5 in. (63.5mm)
Overall length: 3.18 in. (81mm)
Bolt hole: .295 in. (7.5mm)