Daggerz™ brand self-drilling screws are a high quality screw designed for metal-to-metal fastening jobs. The #3 self drilling point drills through metal easily and eliminates the need for any pre-drilling. This self-drilling screw features a high hex washer head with serrations under the head. The hex head provides driving stability and helps seal the connection. The fine threads provide superior holding power. Additionally, the zinc finish is recommended for installations in dry interior environments only.