Flathead screws are the way to go when the screw head needs to be flush, such as with ... Buy 2-1/2-in. fasteners so they will penetrate the concrete about 1 in. to 1-1/4 in.

The countersunk head style is for applications that require a flush-mount profile. Countersinking also leaves a cleaner surface appearance for exposed through-set applications. The anchor head’s ...