3-Position Carburetor Enrichment Knob with Chrome "O-Ring" Style Knob Fits S&S Super "E" & "G" carburetors Features: This kit utilizes a brass retaining nut with 3 steps that allows you to turn the choke/enricher "ON" using a spring and stainless steel plunger. The knob measures 1-3/16" wide x 3/4" tall making it easy to find while the o-rings added grip make it easy to use. This enricher ONLY works with S&S Super "E" & "G" carburetors. Dimensions: Overall Length = 2-7/8" Width = 1-3/16" Thread = 7/16"-20 Finish: Chrome O-Ring Knob Brass Fitment: S&S Super "E" & "G" carburetors.