Shimano RD-SL10 is a high-performance rear derailleur designed for precise and reliable shifting. It features a total capacity of 45 teeth, allowing for a wide range of gear combinations. The RD-SL10 is compatible with freehubs with 28 teeth or less and can accommodate a chain length suitable for a 29-tooth freehub. It comes with an "H" screw for adjusting the guide pulley's position directly below the smallest gear and an "L" screw for fine-tuning the derailleur's performance in the low gear to prevent chain drops and noise.