Supplier: Global T Trading (M) Sdn Bhd The self-drilling screw (hexagon head) is made out of stainless steel and enables drilling even through metals without the need to first create a pilot hole. The hex head allows the fastener to drill easily and not to slip out. These screws are usually used to join materials like sheet metal onto metal or wood especially for uses in building industry machinery. Its features also include easy installation, elevated durability and is rustproof.