COMPATIBILITY: Authentic winding key designed specifically for Howard Miller wall and mantle clocks, ensuring proper fit and function CONSTRUCTION: Durable metal construction with a polished silver finish for long-lasting performance and reliability DESIGN: Three-hole configuration provides secure grip and easy turning motion for smooth clock winding operation FUNCTIONALITY: Perfect replacement key for winding Howard Miller mechanical clock movements with precision and ease SIZE: Compact design with standard dimensions to fit most Howard Miller clock winding mechanisms Winding Key, Howard Miller Original Nickel finish key to wind there wall and mantel clocks. For 4 mm. winding shaft.