Taper square axle sealed cartridge BB.*Square Taper BB (JIS standard taper)*Sealed Cartridge Bearings*BB Shell Width: 68mm*Steel shell and Cr-Mo axleShell Width - 68mmCup Thread - BC 1.37 x 24TAxle Screw - M8 x P1.0 Flange Screw (NOT Included)Average Weight - 338g (113mm)