The GRX BL-RX820 12-Speed Brake Lever with Caliper Set is a left side front brake lever, shaped just as the GRX mechanical shift/brake lever is, with a fully set-up pre-bled, Flat Mount BR-RX820 hydraulic disc brake caliper.

The set consists of the left-side BL-RX820 Brake Lever with the Flat Mount BR-RX820-F hydraulic disc brake caliper with finned disc pads, and all necessary hardware. The system is pre-bled and connected with the SM-BH90-JK-SSR hydraulic hose system from lever to caliper. Shimano's Mineral Oil hydraulic system makes it fairly simple to set the proper housing length and bleed for best braking contact.