Their simple but functional design makes these dogs very easy to build in or retrofit into any bench. Boring a simple 3/4" hole vertically through the bench surface is the only installation work required. Dogs (at left in photo) are 4-3/8" long, with friction springs to make them usable in any benchtop thickness. 5° undercut face grips securely, and can be rotated as needed to hold stock that isn't square.