Wilwood 260-5520 1/2" Bore Kart Master Cylinder Wilwood Karting Master Cylinder with a 1/2" Bore (Part #260-5520). This super lightweight (only 0.55 lbs.), 1/2" bore aluminum master cylinder designed specifically for kart & jr. Dragster racing applications incorporate an adjustable lever ratio with a remote mount, clear fluid reservoir for easy monitoring The assembly comes ready to install and includes billet bracket, lock-wired drilled hardware, & fluid line fitting