High quality sealed cartridge bearings with steel cups . Traditional square JIS 2-degree taper crank arm interface. 68mm English (BC1.37 x 24tpi RH/LH). Made in JapanItem Specifications: Shell: BSA, Spindle Length: 103mm, Model Name: QB55, Spindle Interface: JIS Square, Shell ID: 33.6mmx24tpi, Width: 68mm,