These are used for 12mm OD Tubing. 12mm is Slightly less then 1/2". Most likely it will not, but it just depends on the the Brand Tubing you are using. Some try to cater to both Metric and Imperial.
You may want to try posting your questions in one of the watercooling forums like OCN or our Facebook watercooling group (link: www.facebook.com/groups/PPCsBuildersClub). Also you can go to Discord (link: https://discordapp.com/invite/U9RtYTm) for help, we have approx 300+ Moderators, Volunteers and customers that help out on there all the time. Someone may be able to let you know if they were able to make them work or point you in the right direction.