Check the listing for details. 2 Pcs 4.4mm x 52mm Wrench Clock Key for Winding, Silver. Condition: New. Listed at 10.75 USD. This clock winding key is designed for winding main springs in most vintage mechanical desk clocks, wooden clocks, wall clocks, alarm clocks, and grandfather clocks. It serves as an essential repair tool accessory for chain wind mechanisms and directly replaces lost or broken keys.Specification:Color: Silver Tone;Material: Steel;Overall Size: 52 x 52mm / 2.05 x 2.05 inch(L*W);Shaft Diameter: 8mm / 0.31 inch;Square Hole Diameter: 4.4mm / 0.17 inch;Packing List: 2 x Clock KeyAdvantage:Crafted from quality steel with a compact structure, this durable clock key withstands long-term use without bending or breaking. Its two-hole handle design generates greater twisting force while providing a comfortable grip. The exquisite workmanship ensures stability and high hardness for both personal and professional use.