The Shimano GRX ST-RX600 Shifter/Hydraulic Brake Lever is a Dual Control system that offers a light shifting operation on par with top-tier systems. These levers feature an anti-slip design that ensures a secure grip, and a reach adjust mechanism that allows the lever to be adjusted to suit any hand size, riding style, and individual preferences. With the ST-RX600, you can expect precise and efficient shifting and braking performance in a comfortable and customizable package.