This super-compact master cylinder with lever and billet reservoir was specifically designed to be used in conjunction of our Weld On Motorcycle Hand Controls, De Luxe Retro Cable Motorcycle Hand Controls Aluminum and Brass and De Luxe Retro Cable Motorcycle Hand Controls All Aluminum, so they can be used as brake or hydraulic clutch motorcycle levers. Machined out of billet aluminum it can be easily hidden on your custom chopper or bobber for a super-clean look. It can be welded under the seat, under the tank or in any other place hidden or not. This 9/16″ bore custom master cylinder can be used with single two piston brake caliper, four piston brake caliper, six piston brake caliper or dual two piston brake calipers. Mounting bracket will need to be fabricated and welded to the desired location.