Great addition to your 1x drivetrain. By changing just one cog on your 10-speed cassette, you can extend the range of your groupset at no extra cost. Combine this cassette extender with a Blackspire Snaggletooth up front and you're ready to ride . CNC 7075 T-6 For Shimano FC-M782, FC-M672, FC-M622 and FC-M612 96BCD cranks Comes with spacer and longer B-screw For use with 10-speed drivetrains Anodized with laser etched Graphics