Listing includes a genuine German made synchrometer plus a 52mm adaptor for use with single choke carbs. which have an air filter neck outside diameter of 52mm. The adaptor snugly fits over the carb. neck so you can easily use the synchrometer to balance twin carbs. 

Suitable for Weber ICT ICH Dell'orto FRD FRDA FRDB and some Solex carbs. with a 52mm neck.

• Instructions included.
• The original genuine high quality German made product
• Other adaptors available