Self-tapping pan head combination screws engineered for rapid fastening in metal, plastic, and composite materials. The 5.5x16mm specification delivers optimal holding power for light to medium-duty applications. Featuring a combined Phillips and slotted drive system, these versatile fasteners accommodate both manual and power tool installation. The pan head design distributes load effectively while maintaining a low-profile finish. Ideal for electrical enclosures, sheet metal work, and general assembly tasks where speed and reliability are essential.