EBS.

The original ‘Square Hole Drill’ was a revelation when launched and has become the industry standard tool for sinking back boxes in masonry walls. Saving tradesmen thousands of hours, the box sinking process utilises a round cutter to create a 78mm diameter flat backed hole, followed by a square cutter or 80mm wide chisel to remove the corners. This time saving tool is perfect for creating a flat backed hole with a neat and professional finish.