Bottom Bracket Tools
Park Tool BBT-49 16 Notch 39mm Bottom Bracket Tool 3/8" Drive, Black
For installing and removing Shimano and ISIS Drive splined 20T BB cups
Specially designed bottom bracket tool for shop and consumer use.
Combination tool that fits 16 notch external bearing crankset bottom brackets cups and lockrings, and also 8 internal spline crank adjustment caps.