"Blue Dog" Bench Stops. (Pack of 4) The Blue Dog is a product that gives great functionality to your workbench when dogs are needed. Simply use a 2½” hole saw to drill out a hole, sand the top edge, and press the Blue Dog down into the hole until flush. Detents allow easy and accurate height adjustment for any material thickness and the turntable feature allows great flexibility on your workbench. Another great product developed by a cabinet maker on the shop floor.