Whiteside BB501 5 Pc. Bearing Conversion Kit is designed to help you easily adjust cutting depths or profile finish depths on router bits that use pilot bearings. This versatile kit is also i for stair stepping finish depths in precise, controlled increments, making it a valuable addition to any woodworking toolkit. The kit includes four bearings with outer diameters of 3/8", 1/2", 5/8", and 3/4", all featuring a 3/16" inner diameter, along with a 3/32" hex key for convenient installation and adjustment. Manufactured by Whiteside Machine Company in Claremont, North Carolina, this bearing conversion kit ensures reliable performance and precision for your routing projects. Model Number: BB501