Review on Premium Presta Valve Adapters and Stem Caps Combo - FineGood 20 pcs Set for Bike Tire Inflation, Presta to Schrader Conversion, with 10 pcs Dust Caps by Robert Chandrasekar

So far I've never had to give a bad review. Do not buy! that's a shitty bad workmanship. Either the caps don't fit at all, or you better have a sling and a dice to chase all the threads. Raw aluminum doesn't work at all in this case, because the part on which the cap is screwed is not machined enough, i.e. there is almost no thread. Out of the 20 I received only 4 look like they could be used. . Good thing they were cheap and not worth my time sending them back at this point. Good thing I only have two bikes, I have to ride them.