These metering orifices control fuel flow into the metering system. They are rated in flow capacity cubic centimeters per minute and are changeable for tuning purposes. The shape of the entry, exit, and size determines flow. All holley main jets are flow tested and then stamped with the correct number. Features Control fuel flow into the metering system All holley main jets are flow tested and then stamped with the correct number Specification Compatibility - Holley model 2010, 2300, 4010, 4011, 4150, 4160 and 4500 carburetor Type - Gasoline End size - 0.25 - 32 unf thread Jet drill size - 0.094 in. Material - Brass Quantity - Set of 2 - SKU: KSAO65019

These metering orifices control fuel flow into the metering system. They are rated in flow capacity cubic centimeters per minute and are changeable for tuning purposes. The shape of the entry, exit, and size determines flow. All holley main jets are flow tested and then stamped with the correct number. Features Control fuel flow into the metering system All holley main jets are flow tested and then stamped with the correct number Specification Compatibility - Holley model 2010, 2300, 4010, 4011, 4150, 4160 and 4500 carburetor