1. Provides secure metal to metal fastening without the need to pre-drill and reduces cam-outs for high-performance drive surfaces and recess 2. Precise point designed to drill, tap and fasten all in 1 motion 3. High-performance drive surfaces reduce cam-outs to penetrate surface the first time for easy installation 4. Zinc plated finish protects the job’s appearance 5. No tool slippage even with older sockets and worn bits 6. Pan head and Philips drivePhillips pan head self-drilling screws have a sheet metal thread with a self driller cutting (TEK) point to pierce through 20 to 14 gauge metals. The higher the TEK number the larger the drill point to pierce heavier gauge metals. The heads use a Phillips driver #1, #2, or #3 depending on the size of the screw. These screws are used in the exterior elements. *For the fastening process in steel, they are used on steel frame construction or fastening other materials on steel. * For the fastening process in wood, they are used for applications in wood structures or industrial lightweight constructions, such as roof deck, flooring. * For the fastening process in aluminum, they are used for special industrial applications, construction, and manufacturing of windows.(1). High quality: we make 100% quality test before shipping (2). Rich experience: we have been in this line for more than 20 years (3). Competitive prices: the same quality, but cheaper prices (4). Timely quotation: we can send you prices soonest on the same day (5). Good services: we supply OEM, ODM, OBM services and the best after-sale services (6). Punctual delivery: we can ship every order on time