Box One Single-Speed Chromoly Cogs are CNC-machined from long-wearing CNC-machined from chrome-molybdenum. It’s designed to fit Shimano compatible cassette hubs & has a 5mm wide inner base, giving a more solid interface w/ the cassette body.

FEATURES:

• Shimano Compatible Driver
• 3/32″ or 1/8″ Chain Compatible
• Heat-Treated Chromoly
• Heavy Duty