... . Zinc plating or phosphated: white/yellow/balk/grey Self Drilling Screws DIN7504 (K, L, N, P ... / ASME B18.6.4 & SAE J78 specifications Self-drilling fasteners for attaSelf Drilling ScrewsDIN7504 (K, L, N, P, ... B18.6.4 & SAE J78 specificationsSelf-drilling fasteners for attaching into metal, aluminium, or stainless steel. Drills ... one easy operation. No more need for using the other pre-drilling tools. ...