The inner diameter is 6.1mm, you need to check you shaft adapter, if the threaded shaft that mounts the propeller is less tha 6.1mm you can use these, otherwise you have to drill in order to expand the prop hole (not reconnended because the balancing will be more difficult,).
Use these with DT750 motors that mounted with plastic clamps (zip ties). When prop hit anything motor cuts off from it's base but motor and prop still alive. And even after hits (can be seen where plastic becomes more white) all props still works. Strongly recommend that.
Just got a bunch of these and they seemed very good for the price. Just a little bit unbalanced, easily fixed with a small piece of tape. Flew 15 min w my hex and noticed they were very quiet.
I use 3S and D2830-1000kv and a 3kg hex w zero FC. Very stable.
I used over 40 of these with DT750/3S quad and never had a problem. All have been bent/broken only by severe crashes, never midair. These are SF (Slow Fly) propellers, maybe you misusing them by using motors with higher kV and therefore they break midair.
im just using 900kv motors on a 3s battery, im not the first person who happend to have a mid air prop break. its a hit and miss, maybe your batch are good, and mine are bad. i have 2 sets of this props, my first set ddint break, even after hitting several obstacles, while my second set, that was new broke mid air.