Movement Hole (pinhole): Precision Hole (coarse hole) Material: Stainless Steel, Plastic Color: Black Movement Size: 5.6cm x 5.6cm x 1.6cm Total Shaft Length: 12mm Thread Length: 5mm Package Included: 1 x Watch Movement DIY Repair Clock: This watch movement can be used to repair or replace a broken clock movement, or as a component for handmade projects. It requires a 1.5V AA battery (battery not included). Hour hand hole diameter: 0.55cm Minute hand hole diameter: 0.35cm Second hand hole diameter: 0.1cm Installation Steps: 1. Install the hour hand first. 2. Install the minute hand second. 3. Install the second hand last. Align all hands at the 12 o'clock position. Keep the hands parallel and ensure they do not rub against each other or the clock face. Make sure the second hand does not touch the glass to prevent time inaccuracies.