Feedback Sports BB / Cassette Wrench The Feedback Sports BB / Cassette Wrench is made from cast steel, providing it with great durability for the years to come. It's designed to fit Shimano and SRAM cassette lockrings and external bottom brackets. Features Fits Shimano(R) & SRAM(R) cassette lockring External bottom bracket wrench Centerlock brake wrench | Feedback Sports | Bb / Cassette Wrench Bottom Bracket / Cassette Wrench