MF63ZZ bearing is a flanged ball bearing made of chrome steel in which the bearing is metal shield from both sides It has an 3mm inner diameter, a 6mm outer diameter, a 2.5mm thickness, and an 7.2mm flange.
F608-2RS bearing is a flanged ball bearing made of chrome steel in which the bearing is metal shield from both sides It has an 8mm inner diameter, a 22mm outer diameter, a 7mm thickness, and an 25mm flange.