The Shimano 105 ST-R7120-R is a right-hand drop-bar dual control lever for a 12-speed Shimano road setup. It combines shifting and hydraulic disc brake control in one lever, making it a practical choice for road riders building or replacing parts on a 2×12-speed Shimano 105 system. Shimano describes the lever as having updated ergonomics, a revised lever position, and a shorter reach curve to improve access for a wider range of hand sizes. It is intended for road bikes and works with Shimano road 12-speed mechanical shifting and hydraulic disc brake components.