Large Diameter Replacement Clock Mechanism with Black Hands is a smooth-operating quartz crystal replacement mechanism. This is perfect as a replacement to our Large Diameter Clocks or for custom designs. Smooth operation (no ticking) Indoor use only High torque for long lasting movement Long black hands included This Clock Mechanism serves as a replacement for our Large Diameter Clocks that come with black hands. The hands measure approximately 6.5" for the hour hand, 9.25" for the minute hand. The mechanism is approximately 2.2" x 2.2" x .625", and has an included steel hanger with it that is able to be removed for other hanging methods. The threaded spindle area measures approximately .3" diameter and .34" in length. We include printed instructions with our Clock Mechanism along with online instructions that detail the simple install of the Clock Mechanism. The mechanism uses 1 AA battery (not included).