Self Tapping Metal Screws - 3/4 Inch

This Size Self Tapping Screws has 2 typical uses.
1. To attach 1/16 to 5/16 Casement Turn Clips to Aluminum Window Frame.
2. Screw directly through 5/16 thick screen frame into Aluminum Window Frame.
Drills the hole and installs in one step using an electric screwdriver and 1/4" driver bit.
Does not work in wood.
Note: the drill portion reduces the length of the threads.
Enlarge picture for details.