Shimano BB-UN300 Square Spindle 68mm Bottom Brackets
Features:

• Fits JIS square-taper cranksets
• Crankarm fixing bolts sold separately
• Hollow spindle

Specifications:

• Frame Interface: BSA/English Threaded
• Spindle Interface: Square Taper JIS
• Bottom Bracket Shell ID: 1.37
• Shell Width: 68mm