Those are really nice when trying to poke about smd bits or picking up a signal on a plug-in breadboard just between the insulation of jump wires and where it goes into the hole.
They do not work particularely well IMHO. Their utility is limited by the fact that they have to be stuck onto the standard probes. They can give you some reach, but for SMD work, it is as awkward as dancing on stilts.
For the combination of long reach AND a fine point, I think that the extensible ones from the big Pomona kit are unsurpassed, as you can adjust them to the length that is needed.
Another thing that I do not understand with this kit is why they provide two of the fine type hooks and only one of the type which is more suited to general use. It would make more sense to me if they integrated it with the missing elements of their U1161A kit.
The last probes I bought were a pair from Mueller, because for a short time they were bundled with the KT-MS001 accessory kit (but lacking all others), which contains some interesting items. Especially the thing that can be shoved in-between a stack of batteries did raise my curiosity. The probes themselves are ok but not special. Can't recall whether it was at RS or Digikey.
@Saskia: if you are short of probes, treat yourself to a set of Fluke TL175E (not TL175!) Twist-guard. They are very fine general use probes and the E version comes with threaded 4mm adaptors.
Which part did you like most about that kit? I might find some parts of it except the probes/leads.
If you did think about fine-pitch, read above why they are nogo. The assembly with the stuck-on extensions becomes too long for the required precision.
In that case, would you like to get a pair of those:
https://www.eevblog.com/forum/testgear/useful-adaptor-techniques/msg1223935/#msg1223935I still have some of the sockets left, but you would have to wait until I can order the necessary SKS components (2mm cable jacks) and the 0.25mm² (or similar, but 0.5mm² should be maximum) fine stranded silicone leads. And I would not want to foist the chinese wire on you should be Staeubli.
Shrouded/unshrouded 4mm as per your choice. I also made some of those as extensions with a length of around 10cm, which can be connected to any 4mm leads. Some needles are in spare too, but not all shapes. Contrary to the SKS micro probes with their far too weak springs, they penetrate a solder mask easily and won't slip from a small contact area.
(Available from the ShrewWorks exclusively!)