Yes, mainly concerns me, I should have read the product description more closely. I was looking for a 41/64" bit, settled on this one because it was a Forstner and had good reviews and bought it (along with another one, see below). Of course when it arrived it was very clearly marked 16mm on the packaging. And 16mm is definitely NOT the same as 41/64". In fact, 41/64" isn't even the US standard size closest to 16mm! (5/8"). Converting both to decimal inches, 16mm is 0.011" less than 41/64"β¦