The pin or spur of a marking gauge is a small pin with a sharp pointed tip. The pin is dragged along the wood with the point marking a thin, even line.
Marking gauge fence
The fence is a solid piece of wood that butts up against the user’s workpiece to hold the marking gauge’s position. It can be moved along the stem and secured in position with the thumb screw.
It has two brass panels running down the front to prevent both the tool and workpiece from scratching each other.
Marking gauge stem
The stem is the main body of a marking gauge, the pin is secured through one end of the stem. Larger marking gauges have longer stems to allow them to reach over larger work surfaces. The fence can slide up and down the stem to allow it to be set to different measurements.
Marking gauge thumb screw
The thumb screw can sit on top of or behind the fence. Once the fence is in the correct position for the workpiece, the user turns the thumb screw clockwise to secure the fence in place and prevent it moving.