Stupid IKEA! They sell plumbing products (in my case, an Enskar faucet) which are UNUSABLE out of the box!
Go ahead, install those faucets... until you go to hook up the water. What gives? Oh, that's a 3/8" tube; you'll need a compression fitting to adapt to your 1/2" supply lines coming out of your wall.
BUT WAIT.
It looks like 3/8. It feeeeeeeeels like 3/8. It is all chromey shiny and pretty! BUT IT'S NOT 3/8".
It's ten millimeters, because IKEA IS SWEDISH.
Now sure, you could simply blame America for not getting on the metric bandwagon decades ago, but that would be un-American! It's up to everyone else to adapt to US! Yeah! Fookers!
Save yourself the trip(s) to IKEA, plumbing supply houses, and Home Depot. No one is going to have a 10mm>1/2" adapter. Luckily, this guy has a solution, and there's an even sweeter one in the comment section if you have advanced skillz.
http://fromsteve.blogspot.com/2006_0...e_archive.html
I should point out that IKEA Emeryville gives no warning, no information, no parts of any kind to address this issue. I suggested they put up a sign, and was told "Ha ha, that'll never happen."