Sealed Bearing Extractor Set for Bottom Brackets Essential Kit.These extractors remove sealed bearings with inside diameters from 22, 24, 29, and 30mm.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.All extractors are size-specific! If attempting to remove a bearing of a different size than the extractor, you will permanently damage or break the extractor.If the extractor is smaller than the bearing, try using a shim between the extractor and the bearing to get the tightest fit before tightening the extractor bolt.Removes these sealed bearing sizes:6806, 24x37, 29DUB, GXP22.4-piece set includes:(1) 22mm ID Bearing Extractor.(1) 24mm ID Bearing Extractor.(1) 29mm ID Bearing Extractor.(1) 30mm ID Bearing Extractor.(1) Spare parts bag.(1) bolt set.Removes these sealed bearing sizes:6806, 24x37, 29DUB, GXP22