3.5 x 42mm Drywall FX4 Bugle Head Sharp Screws - Black Phosphate

Dry wall sharp point screws with a bugle head and a philips drive.  The bugle head reduces the likelyhood of damaging the board surface. They can driven straignt into maximum of 2.0mm thickness of metal to secure the boards into place without the need to pre-drill saving time.  There require a philips No.2 srewdriver bit.

These are black phosphate fasteners which has little preventative measure from corrosion.  Also bear in mind using different materials can cause fusing through corrosion especially in damp conditions when mixed with aluminium or stainless steel materials.