Guide Bolt Bottom Bracket M15X1 - Sn.72-F (Snap-In 2017 FREE shipping within Australia over AU$100.00 In stock. Available via Buy Online Only Share Loading Facebook Like button... Guide Bolt Bottom Bracket M15X1 - Sn.72-F (Snap-In 2017 FREE shipping within Australia over AU$100.00 In stock. Available via Buy Online Only Share Loading Facebook Like button...