Choose the jets size from the sales drop down list. Only ever use genuine Mikuni parts when attempting to correctly tune out rich or lean engine conditions.
The Mikuni N224.103 pilot jet has a total length of 28mm with a 2.5mm outside diameter of the thin end tube with the bleed holes. This jet is also identified by the machined groove next to the size stamping. Be careful not to confuse this jet with the VM28/486 which has a 1/2 mm smaller diameter end tube.