drip caps

[chalcedon]

Hello.
Does anyone know the diameter of pre drilled mounting holes is aluminum after market drip caps?
Also; what size would i need to fit 17 inch windows?
Not too sure how the drip caps are measured.
Thanks.
Eric..

[markdoane]

If you are asking about the drip caps made by Grace Manufacturing, the overall length is the window length + 3 1/2", and you order by window length. They are available in increments of 2 to 3".

So if you have a 17" window, you would order a 18" drip cap, and the overall length would be 21 1/2".