Center Position: Center line. When scribing plate grooves, pin joints, assembly work, etc., the center marker is suitable for determining the exact location of the center of the board. Easy to Use: Easy to use. Simply insert the pencil into the center of the template and make your mark. High Quality: Made of ABS plastic, environmentally friendly and durable. Side Line: The marker can be used to draw side lines so that the marking and edge distance of the board are the same. There are eight sizes. Wide Application: Suitable tool for woodworking to determine the exact location of the center of the board when cutting plates, jointing, assembling, etc.