faucetscrewdriverscrews
I am trying to unscrew the screw head you see in the picture. It is from the kitchen faucet handle.
From looking online, it is usually a hex screw head. I tried a hex-key wrench, it didn't work, and tried every tool I have that could fit with no luck.
I am clueless, which one to use. Appreciate any help. Thanks!
Ratchets can be rather bulky as you've found. Combined with a deep socket in the wrong place, you aren't going to remove the fastener. Using a shallow socket and and proper length extension moves the ratchet out of the way to where it belongs.
Straight Drive Extension
Wobble Drive Extension
The wobble drive allows for some misalignment between what the socket is removing and the ratchet drive handle, probably what you're looking for to take care of the fact that gear is in the way.
Or you use this drive handle to convert the socket to a simple nut driver
Then there's the time honored nut driver
Those are levelling legs.
Dishwashers are either held in via screws on top of the dishwasher that attach to countertop above, or that screw the side (look roughly 1/3rd down just inside the DW door) of the dishwasher to the surrounding cabinet.
Best Answer
It appears that the hex sides of that screw head have been rounded off due to the use of an ill-fitting hex wrench. A metric and an SAE hex wrench will both fit in there, but the use of the wrong one, while it feels like it fits properly, can be just loose enough that if the set screw is corroded in a bit, the wrench can slip and round over the edges.
You will need a screw extractor, like this:
Image courtesy of Lowes.com. No endorsement of brand or vendor intended or implied.
You insert this into a drill and run the drill in reverse. The extractor has a reverse thread that drills into the head of the screw and also turns the screw to back it out.
For the small added expense (and probably near impossibility of finding them individually), I'd suggest that you purchase a set of 3-5 extractors. That will help ensure you have the proper size for this screw, and you'll have a variety for future use. Note that these should work on nearly any screw with any type of screw head - slotted, Phillips, Torx, or other - not just the hex head of your set screw.
Once you have it out, you'll need to take it back to the hardware store/home-improvement center to buy an exact match (thread & length) replacement. As much work as you put into getting it out, you don't want to reinsert it and have to do it again...