Shaft Length 18.5mm Quartz Clock Silent Movement + Luminous Hands DIY Kit,Spec: Movement +817 1. Suitable for DIY quartz wall clocks, wooden wall clocks, metal wall clocks, craft clocks, frameless wall clocks, replacement of bad clocks, etc. 2. Sweeping seconds silent clock movement, precise timing, no sound; with metal hands, you can repair, replace or make your own clock 3. Movement shaft length: total shaft length 18.5mm, thread height 12mm, suitable for 5-9mm thick clock panel 4. Movement size: 56 x 56 x 16mm 5. Hand size: (measured from the round hole to the end of the hand): -616: hour hand 63mm, minute hand 90mm, second hand 90mm, suitable for clocks over 200mm in diameter -746: hour hand 55mm, minute hand 85mm, second hand 90mm, for clocks over 200mm in diameter -817: hour hand 50mm, minute hand 70mm, second head diameter 7mm, for clocks over 180mm in diameter