do u have a link for these fittings
Its their low profile 16/10 compression and I wouldn't recommend them. Don't get me wrong, very nicely made and o-rings are decent, but with ZMT tubing they're tricky to tighten down, and don't have a hex insert or flats, so getting a solid fit into blocks is harder than it needs to be.
We can't link competitors and OCUK don't sell them.
I actually like XSPC fittings, they've got a cutout in the tip for tightening (just snug of course) and the gnurling makes them easier to cinch onto tubing. Cheaper than others, gnurling isn't too sharp, quite low profile :
Example here
I like their replacement o-rings too, always keep a few dozen, lightly lubed, stored with dessicant.
To be frank most of my fittings are old EKWB stock, pre-torque and I like them a lot; wouldn't buy them at present due to the shady business practices.
Personally my view is fittings are buy once for non-rotaries, mine are many years old. I just put new o-rings on for new builds. It's an investment, and most of the ones I own have been in five builds or more, and I bought them on the Members Market.