So, they cost a lot compared with buying a whole track set with six included but they are indispensable and make the thing so much more useable. It always peeved me that Kitchen Kraft only provide six hooks (the two end pieces could easily have been hooks at minimal extra cost) but at least these make it possible to rectify the situation. Others have commented on poor finish but they seem perfectly fine to me, exactly like the originals, and I don't often take them off and examine them!
This is an excellent option to increase the number of objects you can hang at your Kitchen Kraft. Price is competitive and delivery fast as usual. Only warning make sure your bar is very firmly attached to the ceiling if you are going to hang lots of heavy stuff from it!