Throttle cable adjuster - of the type with tapered top hex, the same as fitted to original Monobloc and 276/289 roadgoing Amal carburettors.
as can be seen from the accompanyning photos, these adjusters look identical in design to the original design - as shown alongside an original Amal Monobloc cable adjuster - with slightly tapered hex top. This type of adjuster were originally fitted to both Amal Monobloc and earlier 276/289 carbs without locknuts - as the tops for this type were normally threaded. I believe they were also fitted to later Amal carburettors
Please check the top of your carburettor before ordering though - as some variations of carb tops for these models were made to take a non threaded ferrule - in which case you may want to fit the original design of throttle cable for that type, which normally had an adjuster mid cable.
Final point on these - as sold here, this listing is for the cable adjuster only - normally fitted like this when the top of the carburettor was threaded. However we also sell the same adjuster complete with locknut - Item 0145 - which is useful if the top of your carb is not threaded, and the locknut can be used to adjust the height.