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The Birzman BB Socket BSA30 / 386 Double Sided Tool is compatible with 12-notch 46.5mm or 16-notch 48.5mm bottom brackets and designed for use with a 1/2″ driver. Made from CNC machined 7075-T6 aluminum, it ensures precise engagement to protect the notches on your bottom bracket. SKU: BZBM18BBBSA30.