What are self drilling screw, and how do they work?
Self-drilling screws, also known as TEK® screws, are available in a wide variety of head styles and finishes to fit the demands of nearly any application. Tengri manufacture and offers more than 20 different head style self-drilling screws, in both steel and stainless steel. Self-drilling screws enable drilling without first creating a pilot hole. These screws are usually used to join materials like sheet metal.

These Flat Head screws have a point “like a drill bit”, these screws create their own hole, and their own 

thread in one action.
This is probably where the confusion with self-tappers comes in – both kinds of screws are technically 
self-tapping as far as the function of their threads are concerned, but the massive difference is in the
 function of their points.
* High Quality Steel with Superior Rust Resistant Ensure, More Solid and not Easy to Break;
* It is wood drill tail screw, mainly used in steel structure caigang watt fixed can also be used for fixing the
 simple
construction of the sheet material;
* How to use? Self-Drilling Screws, eliminate the need for a pre-drilled hole. The length of the drill point 
determines the
material thickness which the screw can reliably penetrate. When selecting a self-drilling screw design, 
it is important to consider the material thickness and type of materials to be joined. These stainless are 
great to use in environments that are damp
* Package: Poly Bags, Plastic Boxes, Cartons, or Customized.
Features
*Countersunk Self-Drilling Screws - Plain Plated
*Stainless steel 
*Countersunk head
*Phillips cross head drive
*DIN 7504P H