I am planning on installing a Roush hood scoop. The instructions say use a 5mm drill bit. I went to Sears & Home Depot and didn't see any 5mm drill bit. What is the conversion between metric system and the american system?
I could only find drill bit sizes written as..... 1,95 (huh). HELP!

 

i know how you feel man, the stock hood scoop calls for a 12mm and 9mm drill bit and i still can not find them so i am just going to let Ford do it when they repaint my hood under warrenty

 

I installed a GTAP scoop on my 05 GT several months ago. I remember checking both Lowes' and Home Depot's drill bit stock and couldn't find exact equivalent to metric sizes, so in some cases I went just under the equivalent. With some people reporting GTAP scoops not fitting flush, I figured going slightly undersize woul result in a tighter install. The install went very smooth and fitment was perfect!

 

To convert metric to english times it by .03937
example...........
5mm x .03937 = .19685 A little bigger than 3/16(.1875)

Class dismissed.

 

I'm waiting for my 9mm & 12mm drill bits to come in from a specialty fastner shop. I love all the metic tools we need for out American cars. I'll bet they're cheap too!

 

As for the number drills, 1-95, An industrial drill bit set consists of your basic fractional drills, plus a set that is sized by letters, and the tiny ones use numbers.

Here is a link for drill sizes and their decimal equivalent.
http://www.thedirtforum.com/conversions.htm

A chart to hang on the wall should be readily available at that fastener store, or a place that sells industrial tools.

 

I actually purchased a 3/16 drill bit but the diameter of the bit seems too large for the screws supplied with the roush hood scoop.

 

Thanks to all that replied!

 

Forgot to post an updated pic with the roush hood scoop.