CNC machined and hardened Chromoly construction for added durability1.37"x24tpi (right handed) threadsShimano Reference Number: SS-7600
Shimano SS-7600 Dura-Ace track cogs are CNC machined hardened chromoly.
Brand: Shimano, Model: Y27914000, Color: Regular, Size: 14T 1/2x3/32-Inch 1 Speed