Review on Derengge Modern F M4501 MT Single Handle Bathroom Faucet by Tommy Hilmy

My wife bought these to refresh our 1970's style sinks. The faucets look good (modern) and were easy to install, but having used these faucets for less than a year the knobs are already loose and wobble when you pick them up. As far as I can tell, it's not something I can tighten. The handle does not unscrew from the nut under the sink. Something has come loose in the pen body. I regret my purchase and will end up having to replace higher quality faucets. My advice: do more research, don't skimp on something that gets used as a sink so often, and don't buy junk!