Gently used, taken off new bike after 20 miles

The Shimano 105 FC-RS520 is a 2-piece, 4-arm crank that's compatible with modern disc brake road frames.

4-arm crankset for 12-speed drivetrain Compatible with frames of O.L.D. 135mm and 410mm chainstay length 44.5mm chainline 150mm Q-factor Compatible with HG 12-speed chains Manufacturer Part Number: EFCRS520EX04 Box 12