The Edelbrock Metering Rod is designed for use with the Edelbrock Performer Series and Thunder Series AVS carburetors only and not with any other brands. This secondary metering rod works on any year Quadra jet. The diameter of the tip is 0. 0410 and weighs approximately 0. 03 pounds. The dimension indicates the tip diameter, not the shaft diameter. It has a letter code-CE for identification.