I almost bought the 'screw-on types' of HB, but to make sure that they were the right choice I asked for advice at Thomann service. Fortunately, because the HB would actually not fit the HB SC-550 since these are 'star shaped - split shaft'.
They look great and have exactly the same 'shade/colour of gold' as the details on my guitar (humbuckers, bridge etc), so a perfect match!
They feel solid and have a nice and secure grip. Easy to install, just slide them on and you're done!