This is an authentic Delta replacement part. The bearing is designed by the manufacturer for use in power tools such as sanders, planers, and jointers. This part is made of metal, and is generally used to allow components to spin easily. It may be found in various locations in the machine, depending on model. Please be aware that ther...Read moree are different bearings used in the machine. Refer to the parts diagram to be sure of ordering the correct part. You may require a screwdriver or wrench when replacing this part. This item is sold individually.