What is a #3 multi-unibit?

[keithert]

The instructions for my new spoiler say to use a #3 multi-unibit to drill the holes? What exactly is a #3 multi-unibit?

[pinoyesv6]

http://www.arizonatools.com/img/products/A/AZT4UNIBIT.JPG
http://images.orgill.com/200x200/6978357.jpg

thats not a #3 but yea thats what the bit looks like