This is a good reproduction of a kit which was made in the 1960s and 1970s to adjust, tune and synchronize SU carburetors. We have a set of these and use them often. Well, as often as we bother to tune the SU's, that is, which isn't as often as we should.....
Includes a jet wrench, instruction booklet and enough special carb tools to balance two or three carburetors.