The TL-FC36 is used for mounting and dismounting of bolted Hollowtech II bottom brackets as well as retaining rings of brake discs on 20 or 15 mm E-Thru thru axles. Details: The special design allows the tool to be turned without hitting the chain stay; Secure fit of the teeth by laser cut; Stability and long durability; With ergonomic handle Material specifications: Chrome-coated chrome-molybdenum steel Application: bottom bracket Tool type: bottom bracket key Scope of delivery: 1 Shimano TL-FC36 bottom bracket tool.