M4.2x16mm #8-18 Thread Hex Washer Head Self Tapping Drilling Screws Bolts 30 Pcs

Self-Drilling Screws also known as Tek 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. 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.?It can not be used in combination with metal and metal. Teks self-tapping screws provide secure fastening with strong holding power without the need to pre-drill. Engineered drill-point and flute remove material efficiently and properly size the hole for threads.