Eowpower 4 Pieces 8 mm Bore Diameter Ball Mounted Pillow Block Insert Bearings;

Bearing Size:
Total Size(Approx):55 X 28 X 13mm / 2.2" x 1.1" X 0.5" (L*W*H)
Hole Inner Diameter:8mm / 0.31"
Outside Diameter: 21mm / 0.83"

Mounting Hole Diameter:5mm / 0.2"
Holes Centre Distance:44mm / 1.7"