Swede-wheel surface-mounted ball roller screwed mounting

Ball roller for surface mounted screwed installation with a larger steel ball immersed in a bed of smaller steel balls. The ball housing is made of galvanized pressed sheet metal, and is self-cleaning via cleaning holes in the bottom. Used at workstations for horizontal manual movement of packages/goods with a hard and flat bottom. Placed so that at least three balls in each direction are always in contact with the goods.