Hardened and tempered carbon steel bottom bracket tool with 20 splines/teeth, suitable for removing Shimano and ISIS splined bicycle bottom brackets. Use with 32mm spanner or socket. Painted finish for increased corrosion resistance. Hardened and tempered carbon steel bottom bracket tool with 20 splines/teeth, suitable for removing Shimano and ISIS splined bicycle bottom brackets. Use with 32mm spanner or socket. Painted finish for increased corrosion resistance.