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Open Bore adapters, also known as drifts, are used to press cartridge bearings in to bottom bracket cups, hub shells, freehub bodies and suspension frame pivots. Each adapter has a smaller diameter that inserts in to the center of a bearing, and a larger diameter section that matches the outside diameter of the bearing. When used with a bearing press, the adapter presses against the races of the bearing, properly aligns the bearing and prevents damage as the bearing is pressed in.