Oval Tandem Black Out 1-1/8" Bore Master Cylinder Disc Disc Proportioning Valve Description: Brand new All Black Master cylinder kit with Disc/Disc proportioning Valve Kit. This master cylinder mounts with 3 3/8" bolt measurements, has a 1-1/8" Bore and can work with Manual Brakes or A Power Booster. Package includes: Black Oval Tandem Master Cylinder with 1-1/8" BoreBlack Disc Disc Proportioning Valve Kit Professional Installation is Highly Recommended (No Instruction and Wiring Diagram Included)