Brand new Zinc Bail top master cylinder. This master cylinder is the Bail Top Style & has a 1" Bore. Mounting holes measure 3 3/8" center to center. This works great for most drum/drum, disc/disc or disc/drum applications.  This is a four port master cylinder, so you can use the ports on whichever side you need and block the others.  It includes plugs for the ports you do not use.  This is a great upgrade over a standard GM style master.