The HC hook is the only manual 'thumb-screw' hook that we sell, there are a few still around but they have been largely superseeded by the self-locking range we have available. This is a small solid hook which gives a user the ability to control how tight they need the screw.
The hook itself holds 5kgs on the nylon / perlon hanger meaning that you can hang up to 10kgs using two of them on one picture.
For a majority of pictures this will be a great choice, easy to use and adjust by the millimeter.