BIRZMAN EXTERNAL BB SOCKET FOR SHIMANO HOLLOWTECH II

Compatible with Shimano Hollowtech II or other 16-notch 44 mm diameter external bearing bottom bracket cups and 16 notch rotor disc lockrings (incl. E-Thru axle hubs).
functions: 1/2" drive
material: CNC machined hardened steel
size: Ø55 x 45 mm