Wire brush is a bit to brittle for small holes and tends to bend and sometimes break offThese little brushes are flimsy at best. They bend easily when you’re trying to poke out a hole and then you have to re-stick again and again with a bent wire. If the wire was stronger they would be fine but I would not purchase these again as is.The first couple I used the tip came off, so I gave up using them. Not sturdy.UselessThese work pretty well. I didn’t realize that the blockage caused more pressure which I liked better than we opened up the blockage and the pressure was lower.These little brushes are awesome! I got them for my kitchen sink sprayer that got clogged with all the calcium buildup and it worked great. The handle is grippy and long enough to allow for a good grasp while pushing the brush into the tiny little holes. Next was my shower head, not because I thought it was clogged but because I was on the roll and wanted to poke more holes! It’s quite satisfying actually. Found out my shower head did need some de clogging and what I thought was a low water stream was actually my shower head holes were stuffed with buildups from the water. It’s about 2 years old and I still considered it new but not until I put these little brushes to work! Now it’s new again. There are plenty of brushes (50pc) so this should last me a while. They’re firm and while the handle is made out of plastic, the core of brush is made out of metal and it can definitely take some beating. They don’t bend easily.