Used Cross Recessed countersunk head self-tapping screws, ST4.2x19, carbon steel — a compact, reliable fastener ready to tackle quick assemblies where a flush finish matters. These pre-owned fasteners are designed to bite into softer materials and form their own threads as you drive, delivering a solid grip in wood, thin metal, or plastics while keeping the surface smooth and uninterrupted.

Key features that make these screws stand out:

• Drive type: cross recessed (Phillips) for compatibility with common drivers and bit sets
• Head style: countersunk/flat head sits flush with the surface for a clean, professional look
• Material: carbon steel provides dependable strength for everyday fastening tasks
• Size: ST4.2x19 indicates a 4.2 mm diameter and 19 mm length, suitable for thin materials and shallow joints
• Condition: USED — may show minor prior-use signs but functionally solid for immediate projects
• Ideal uses: attaching brackets to wood or soft metals, securing thin metal sheets, cabinetry assembly, furniture repairs, and DIY tasks where a flush finish is preferred
• Tips for best results: use a proper driver, consider a pilot hole in metal or dense materials, drive steadily to maintain alignment, and avoid overtightening to prevent stripping; for outdoor or moisture-prone applications, consider coatings or a corrosion-resistant alternative

These used screws offer a cost-conscious solution for non-structural, quick-assembly work. They deliver reliable thread engagement and a neat, low-profile appearance, making them a practical addition to any workshop, hobbyist project, or light-duty repair kit.