New 7" zinc plated power brake booster and master cylinder combo. This top quality power brake booster is designed mount directly to your factory firewall. This power booster works great as an upgrade from manual to power brakes for vehicles with automatic transmissions. Also included in this kits is a top quality factory style 1" bore single bowl master cylinder equipped to work with 4 wheel drum brake applications. Master Cylinder Bore Size: 1 in, Bowl Design: Dual Bowl, Master Cylinder Material: Cast Iron, Master Cylinder Finish: Natural, Reservoir Included: Yes, Reservoir Material: Cast Iron, Master Cylinder Cap Included: Yes, Brake Booster Type: Single Diaphragm, Brake Booster Diameter (in): 7 Booster Material: Steel, Brake Booster Finish: Zinc, Brake Pedal Rod Extension Included: Yes, Mounting Hardware Included: Uses Original, Quantity: Kit.