BaByliss Pro clippers come in a range of shoe sizes, although the specific sizes you mention (4, 5, 7, 8, 9 mm) are not included with the product. Accessory sets for BaByliss Pro hair clippers generally include different lengths of clipper, as shown in some sets that offer lengths from 1.5 to 19 mm. For the exact sizes you're looking for, it would be best to check directly with the manufacturer or an official retailer.
My sister-in-law has a small hairdressing salon and uses the same one. She also recommended it to me.
The cutting performance is brilliant. I can't say whether it also works on curls. But I see no reason why not.
I use it regularly for my beard. it's great for a predefined length. The cutting performance is also brilliant. However, when cutting to 0mm, I think there's a bit of waste (probably more than 1mm). I previously had a cheaper model (Remington "Beard Boss" MB 4125), which left much less when cutting to 0. However, due to the lower sheath performance, I had to cut my beard much longer.
As a beard trimmer it is classic and powerful. A bit heavy which is an advantage in my opinion. As a razor it could be a bit irritating in my opinion. I know a barber who uses it professionally.
The screws come out easily. I adjusted mine in 5 minutes. But you don't have to remove them completely, just loosen them and push the lower blade to the same height as the upper one.
For the Zero Gap function, the base must be adjusted on the underside with the two Allen screws. This is very easy to do. However, it slightly adjusts the 5 levels, which is not noticeable in the race because it is a minimal adjustment.