The SHIMANO BB-UN26 cartridge bearing bottom bracket is a square axle component. It is a piece for frames with a 68 mm Euro type case (with English thread).
+ SHIMANO design.
+ Square steel shaft.
Shaft length : 68mm, 110mm, 113mm, 117mm, 122mm, 122.5mm
Bearing Material : Steel
Bottom bracket type : BSC/BSA (English/European)
Axle type : Square