Size: Total shaft length: 8mm,without thread Total shaft length: 14.5mm, Thread length:6.7mm Total shaft length: 17mm, Thread length:9.7mm Total shaft length: 20mm, Thread length:11.7mm Total shaft length: 22.5mm, Thread length:14.5mm Total shaft length: 28mm, Thread length:19mm Total shaft length: 31mm, Thread length:24mm Wide application: they are fit for cross-stitch, three-dimensional embroidery, craft clock, frame-less draw clock, and specially suitable for DIY quartz wall clock replacement movement parts, etc. Good DIY clock supply: suitable for repairing, replacing the broken parts of a clock or serving as good handwork material to make a clock by yourself. Specification: Material: Copper, Plastic. Match power: this clock movement replacement just need 1 piece of 1.5V AA battery( battery is not included in this package) Package Includes: 1 Piece Quartz Wall Clock Movement