These guides make trimming much more accurate by holding down the spines of a stack of saddle stitched booklets while cutting.

These guides hold down severely curled stock.

They mount on the fingers of the backgauge of most cutters.

Their brass construction makes them a better, more safe choice for cutters, as opposed to other guides, in the event that a guide loosens or rubs against a moving part. (Note: The bolt is not made of brass.)