This rail screws on to your Garmin Xero C1 PRO Chronograph.
It is made from 7075 Aluminum and comes with the correct 1/4-20 black screw for installation.
It has awesome ridges that utilize the body of the Xero to keep the rail from rotating.
It will come anodized but you can have it cerakoted to a color of your liking.
The Xero C1 is now the gold standard of chronographs and is definitely worth a look, buy it HERE