Secure door and window frames with these heavy-duty #6 Reliable zinc-plated flat-head screws. The conical head of these countersunk fasteners sits flush against the surface for a smooth finish. Carve through materials such as plastic, wood and metal with their steel durability. The Type A points of self-tapping flat-head metal screws bore holes, which remove the need for drilling. Pre-drill elimination also lessens dust production for easy cleanup. Their full-thread, 18 TPI structure offers enhanced grip strength that lasts. A #1 Quadrex drive increases the surface area between it and the rivet for high torque tolerance and reduced cam-out. Use these galvanized flat-head screws indoors and outdoors as they resist corrosion. There are 100 3/8-inch screws in a carton. | Reliable Reliable Fasteners Flat-Head Zinc-Plated Quadrex Screw – #6 x 3/8-in – Self-Tapping – Type A – 100 Per Pack FKAZ638VP Reliable | Fasteners Flat-Head Zinc-Plated Quadrex Screw – #6 X 3/8-In – Self-Tapping – Type A – 100 Per Pack .