1/4-14 x 1/2 Phillips Flat Undercut Full Thread Self Drilling Screw Zinc & Bake KPF It has a square drive

It has a square drive head that is designed to be used with a square drive bit

this screw is perfect for small assemblies

making it suitable for both indoor and outdoor use

These 8-15 x 2 1/4 Square Drive Trim Head Drywall Screws are designed for use in drywall applications

It has three prongs that spread out and grip the material

1/4-14 x 1/2 Phillips Flat Undercut Full Thread Self Drilling Screw Zinc & Bake KPF It has a square drive1 4" 14 x 1 2" Phillips Flat Undercut Full Thread Self Drilling Screw Zinc & Bake is a high quality screw designed for a variety of applications. It features a Phillips drive for easy installation, a flat undercut head for a flush finish, and a full thread for maximum holding power. The self drilling tip eliminates the need for pre drilling, saving time and effort. The zinc and bake coating provides excellent corrosion resistance, making it suitable