... quality Counter sunk head tapping screws Carbon steel or stainless steel, zinc plated/nickel plated/black or plain Hardened qualityCounter sunk head philips self tapping ... screwsMaterial: carton steel sae1008, 1018,1022 or stainless steel 201,304,316Diameter : ST2.5,ST2.9,ST3.5,ST3. ... 9,ST4.2,ST4.8,ST5.5,ST6.3Length:6mm-100mm full ...