Designed specifically for a 1.9 x 16 ga. roller. Highly recommended for high speeds and quiet operation. These bearings are one of the most cost effective ways to increase roller service life. The radial ABEC bearing is assembled in the outer housing for easy installation. The hex adapter eliminates metal-to-metal contact between the bearing and axle which reduces noise during operation. Rubber contact seals on the internal radial bearing prevent dirt and debris from entering the bearing but increase rotational drag. Effective against small particle dust and debris. Recommended for high speed powered conveyor applications with moderate to light loads.