Angular Contact Ball Bearings are manufactured in single row and with double rows. They have inner and outer rings with in between balls in a cage of either steel, polyamide or brass. The runways of the inner and outer rings are not in line so that an angle is created. Angular Contact Bearings are available with or without seals. Sealed bearings are maintenance free. Double row Angular Contact Ball Bearings look like two single row Angular Contact Ball Bearings in an ‘O’ configuration, but are less wide. Also the angle differs. The adjustability of Angular Contact Ball Bearings is minimal.