Tilton 76 Series Master Cylinders 7/8" Bore Quarter Turn Panel Fasteners it offers extra margin when

it offers extra margin when used with large piston calipers

Or if they say #6 they are referring to the diameter of the button which is 3/8

Diameter - 11-1/8"

Polaris Lime Squeeze

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Tilton 76 Series Master Cylinders 7/8" Bore Quarter Turn Panel Fasteners it offers extra margin whenTilton 76 series master cylinders incorporate new features, such as the added top outlet port, to provide universal appeal. The 76 Series master cylinder retains its rear port to continue to match the function of the old version, while the added extra deep top port enables the use of a banjo fitting. 76 series master cylinders are not designed for use with ABS.