These extractors remove sealed bearings with inside diameters from 8, 9, 10 ,and 12mm. Bearing extractors grip the inside race of a sealed bearing, allowing the bearing to be tapped out of the hub shell or frame component. Insert the extractor into the bearing, tighten one side with a matching wrench, and the collet expands to grip the inside of the bearing. Tap the extractor & bearing out together with a punch and hammer.Originally Press-5Removes these sealed bearing sizes: 608, 609, 6000, 6001 Wheels Manufacturing Sealed Bearing Extractor Set for Hub Bearings Essential Kit Bearing Tool UPC: 811079027122