The Shimano GRX ST-RX820 left dual control lever delivers light and responsive mechanical shifting for mixed-terrain riding and racing (Note: LD0374 is a non-shift dropper post remote variation for 1x set ups). The ergonomic shifter design improves comfort by decreasing pressure on your palms, while the textured, anti-slip brake lever surface increases control on bumpy terrain. The SERVO WAVE brake lever action provides greater braking power with improved control.Features-Shimano RX820-LA left side Dual Control lever for 1x set ups integrates the brake lever and dropper post lever into one seamless unit that delivers fast and effortless operation, and a cleaner, more streamlined cockpit-Intergrated dropper post actuation with 10mm cable stroke lets you stay focused-Textured hood ensures youre always in control, even on bumpy descents-Anti-slip coating on GRX brake levers means that even in wet or muddy conditions that youll always have Shimanos legendary stopping power on demand-Reach Adjust mechanism allows the lever to be adjusted to suit any hand size, type of riding and individual rider preferences-SERVO WAVE technoloy provides fast initial pad travel to quickly contact the rotors followed with the power multiplication factor to give fast pad-to-rim contact to apply greater braking power with improved control-Optimized for use with flared barsItem Specifications-Brake Lever Actuation:Hydraulic-Brake Lever Use:Left