The kit includes 2 set screws for the housing we have, 2 Seals and 2 glasses in addition to the special screwdriver.
It is an official kit from GoPro, so no quality concerns.
Only the driver seems a little tight, it will serve for 2 replacement, perhaps no more given the small size, but well after if need more replacement will recommend you a kit therefore have a new.
The seal and the glass is easily mounted in 1 min without problem.
In short I recommend the kit that is affordable