The bearing fence enables you to mark a line parallel to a curved edge. The bearings have a nylon spacer between them and run along the edge you are referencing. There are 3 spacers included with the fence so you can set the fence up to suit the thickness of the work peice. 

The bearing fence plate is 8mm delrin, 66mm x 19mm and fits all the scribers apart from the 2 in 1 FB Scriber.

When using the bearing fence you have to be mindful of keeping the pencil square to the edge as there is only 1 point of contact. This makes the standard bearing fence a little more challenging to use than the deluxe bearing fence but with a bit of practice you’ll soon get used to it.