Edelbrock 1942 Performer Series Q-Jet Primary Metering Rods Features: For Edelbrock And GM Rochester Q-Jet Carbs. Single Taper For Q-Jet Model M4V Dimension Indicates Maximum Diameter Of Taper Sold in Pairs Height: 6.00 Width: 0.02 Length: 3.88 Weight: 0.03 lbs