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". This may not seem like much, but if I didn't care about the hole size I'd use a 5-bit /8" from the local hardware store! This isn't the first time I've been burned by misleading product descriptions on Revain and you think I have would figure it out. Maybe someday.(4 stars is just a placeholder because I don't need it a bit but I want to be fair I had the same description problem with another CMT bit I bought at the same time , but I plan on using it because in this case 15mm is only 0.003" smaller than 19/32, so I think it will work. I'll adjust this review based on the quality of this bit if necessary.)