Thread Forming Screws Pozi Pan Zinc Plated Steel Pozidrive pan head thread forming screws.Trilobular thread creates it's own thread during insertion.Eliminates the need for a seperate thread tapping process.Also known as Tritap or thread rolling screws.Made from case hardened zinc plated steel.All screws are fully threaded.Choice of M4, M5 or M6.Screw lengths do not include the head.Manufactured in accordance with DIN 7500.