Top quality, made by Scootopia. Lambretta SH2/22 150cc slide for both Dellorto and Scootopia carbs. 
 
Sticky's Spanner's Manual says - "On 18,20 and 22mm carbs there are a choice of slides to fit. Those with a part number ending -2- are weaker, while those with -1- are richer ". These will only fit the 22mm version.