Shimano ST-MC20 is a Rapidfire Plus shifting lever designed for smooth and precise gear changes on mountain bikes. It features a 2-way release design that allows for quick upshifts and downshifts with minimal effort. The lever is compatible with 8-speed drivetrains and is equipped with an optical gear display for easy gear identification. Its ergonomic design and adjustable reach make it comfortable to use for riders of all hand sizes. The ST-MC20 is a reliable and user-friendly shifting lever that enhances the overall riding experience.