Park tool bottom bracket tool bbt 79accurately constructed from cnc machined aluminium to ensure a snug fit and excellent durability, park tool has made its bbt 79 tool simple to use and compatible with a wide range of bottom brackets. An essential part for use with popular models such as sram dub, its 12 notch fitment makes installation and removal effortless.simple bottom bracket removal and installation the bbt 79 features a 3 8 drive for use with most common ratchet torque wrenches and is anodised for easy identification. Suitable for use on a wide range of 12 notch, 46mm threaded bottom bracket cups, this hard wearing park tool device makes light work of getting your drivetrain working smoothly again. Features material precision cnc machined aluminium finish anodised  size 12 notch, 46mm outer cup diameter suits drive ratchet head size 3 8  compatibility  sram dub, race face cinch, rotor bsa30, zipp vuma, hawk racing bb3086, and more manufacturer's part number qkbbt79  buy park tool workshop from chain reaction cycles, the world's largest online bike store.