... tapping screws Carbon steel or stainless steel,Hardened quality Counter sunk head tapping screws Carbon steel or stainless steel, zinc ... stainless steel 201,304,316Diameter : ST2.5,ST2.9,ST3.5,ST3.9,ST4.2,ST4.8,ST5.5,ST6.3Length:6mm ... plated, brass plated, black phosphated or plain if sus material Counter Sunk Head Philips Self Tapping Screws