The Quartz Clock Movement Second-Hand fits clock movements that take a battery. The second hands come in Black / Gold / or Red. Measure from the mounting post to the end of the long side pointer of the hand to get the correct length. If one needs to be a bit shorter, use a pair of scissors to snip the tip. Easy to install, the hand has a post on the bottom that fits only by friction onto the quartz clock movement. These second hands are optional on all mini movements, the clock can run with or without them.