This is a clever bench dog. Whenever you need a stop, simply press the top and the dog pops up and locks in its raised position (about 5/16" projection), ready for use. When you're done, just press down on the top again to recess the stop into the hole, where it conveniently remains at the ready.
When used in a through hole, the dog sits on a steel plate that is screwed to the underside of the work top; a strong rare-earth magnet at the base of the dog holds it firmly against the plate. To free up the hole for other duty, the plate is easily pivoted out of the way, and the dog removed. A countersunk washer is supplied for blind-hole use.
The body of the dog is turned from solid brass rod, so it is non-corroding and kind to your tools. The 2° inward slope of the face holds wood securely. The spring mechanism is height adjustable to accommodate hole depths of between 2" and 2 1/2" with a diameter of 3/4" (for deeper holes, a dowel spacer can be used).
Made in Canada. Patented.