Chair headrest's black clips are reinforced with thickened construction and metal ring reinforced mounting holes, ensuring a stable, slip-free fit after installation. Office chair headrest attachment features a tool-free clip-on installation, requiring no drilling to modify your existing office chair for quick, hassle-free setup. Office chair headrest attachment is crafted with breathable mesh fabric, premium virgin cotton, and metal components for long-lasting comfort and use. Headrest for office chair 4cm height adjustment and flexible angle positioning, allowing you to customize support to match your seating preferences. This headrest for office chair is designed to fit office chairs with backrest thickness between 1.0-1.9cm and flat mounting surfaces; please verify compatibility before purchase.