Miniature Quartz Clock Insert This compact clock face mechanism fits seamlessly into various small glass and crystal clocks adding a touch of elegance to your decor Compact Dimensions With an overall outside diameter of 144 inches and a mounting depth of just 025 inches this clock face insert is designed to fit seamlessly into a small glass or crystal clock Precise Mounting The mounting inside diameter of 128 inches 325mm expands to 136 inches 35mm with the included ring gasket ensuring a secure and snug fit This round clock insert is perfect for use in clock craft projects Longlasting Battery Power Powered by a PC21 quartz movement with a longlife silver oxide battery included This quartz clock insert ensures reliable timekeeping for an extended period Reliable and Silent This replacement clock insert offers accurate and dependable timekeeping making it a practical choice for your home or office It operates silently and accurately making it an ideal choice for bedrooms living rooms or any area where a discreet timepiece is desired