Self-tapping screws have a set of opposing vertical cutting blades at the tip. These twin blades drill a pilot hole, which avoids the need to use an actual drill bit. Self-tapping screws are preferable in situations where the screw pattern is not pre-drilled, or there is no specific screw pattern. these self-tapping screws are designed for use in soft steel such as aluminium alloy,color steel tile or other metals.
Self-tapping screws are useful for fastening metals, including steel, aluminum and brass. Although they work with most common material thicknesses, thick steel may require the use of multiple screws to tap the initial hole.
