Features: There are six kinds of clock movements with different shaft lengths for you to choose, which are suitable for clocks of different thicknesses. It is quiet and accurate, with daily error of 1 second, low power consumption, and can be used for about six months with an AA-battery (not included). Application: Process clock, porcelain crystal painting, repair and replacement or DIY own clock. The movement of the clock is easy to install and the design is simple and elegant, which is very suitable for different styles of clock frames. Note: Please refer to the pointer installation drawing for the pointer installation methods. The three needle should be installed properly. The three needle should be-parallel when viewed from the side. It is better not to touchs the needle. Specifications: Material: Plastic-Material Movement Size: Approx. 56x56x16mm/2.20x2.20x0.63inch Shaft Length: 16mm/0.63 '' (thread8mm/0.31 ''), Applicable to 4-6mm/0.16-0.24'' Panel Thickness; Shaft Length: 18mm/0.71 "(thread 10mm/0.39"), Applicable to 5-8mm/0.20-0.31" Panel Thickness; Shaft Length: 20mm/0.79 "(thread 13mm/0.51"), Applicable to 7-9mm/0.27-0.35" Panel Thickness; Shaft Length: 22mm/0.87 '' (thread 15mm/0.59 ''), Applicable to 9-12mm/0.35-0.47'' Panel Thickness; Shaft Length: 28mm/1.10 '' (thread 21mm/0.83 ''), Applicable to 12-17mm/0.47-0.67'' Panel Thickness; Shaft Length: 31mm/1.22 "(thread 24mm/0.94"), Applicable to 19-21mm/0.75-0.83" Panel Thickness Package Includes: 1 Set Clock Mechanism(2pcs) note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color of the item.