Durable Plate Adapter with two hold down chains for rectangular Cast Iron Master Cylinders. Width: 4.48 Inches Length: 6.825 Inches Fits the Classic style brake master cylinders Designed for cast iron master cylinders Chain Tension Hold Down Aluminum Body Color Coded Anodized for corrosion resistance Brake Fluid Compatible Rubber (EPDM) Rim Seal Gasket Designed for Pressure Brake Bleeders Easy Grip Caps Designed to work with Automotive type quick coupler