Jet Bing 4 mm.
Bing original means that they are NOS made by Bing in Germany, the others are made in Asia
Original carburetors 12,15 & 17 mm normally have 3,4 mm.
Please check the dimensions of your jet before ordering, we do not take returns on jets.
Dimensions of this jet are :
Diameter head 5,00 mm
Outer dimension thread 3,92 mm
Total height 7,07 mm
Height head 3,09 mm