If you look at how large the shaft is on the kleins and look in the end of the bit you will see the magnet is way larger on the kleins then anything else on the market. Far superior magnetic retention compared to any other bits out there. I have tried a ton. If you look at every other brands bits they all have the same identical magnet as the smallest bit which is the 1/4". The magnets get larger as the size does. For every day use the kleins are worth every penny. O and the wihas suck. The magnets come out. Bonus feature on kleins is there is a hex at the bottom for a socket to slide on to. If you break the shanks on any you can put a socket on the end and weld it. I have a dedicated 3/8" drive set of the kleins i modified

I have a set of the Klein hollow sockets ordered. Can’t wait to be able to carry a set of 1/4 thru 3/4 “deep well” sockets with just one 1/4 impact driver adapter.

If you used "every one of them" I would like to know where you found a 9 mm bolt. I will always respect someone trying to earn money but I do not respect people pushing products they don't believe in. Just an opinion... If you truly believed in a product you wouldn't post an affiliate link in the description...

The others you looked at have hollow shafts to let the bolt extend into it. Excellent review otherwise!