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SPECIFICALLY FOR Bafang MID MOTOR The screw accessories kit is exclusively for BAFANG mid-engines BBS01B, BBS02B, and BBS03 HD STAINLESS STEEL MATERIAL These parts are crafted for durability and resist corrosion, ensuring long term performance Size selection guide: available in three sizes (68mm/100mm, 73mm, 120mm) for mounting screws. Choose the size 68 mm for 68 and 100 mm engine mounts, the size 73 mm for 73 mm brackets and the size 120 mm for 120 mm brackets to ensure compatibility EASY INSTALLATION Includes mounting screws and gaskets for bottom bracket for easy replacement or upgrade The installation kit includes: 1 locking adapter, 1 mounting triangle adapter, 1 outer locking ring adapter, 5 chainring mounting screws, 5 plastic pinion rescrew screws and 2 crank arm mounting screws