Bosch Hammer Drill Bit HCBG25T 7 8 Inch Carbide Masonry Cutter (PowerGrip Hex Shank 12 Length High Speed Concrete Brick Impact Percussion Drilling) Radius Rounding Over Bit Bosch BT170HD 65" Heavy Duty Aluminum Bosch BT170HD 65" Heavy Duty Aluminum Quick Clamp Surveying & Laser Tripod these 21 degree plastic strip collated nails feature annular ring shanks that interlock with wood fibers to prevent fastener backing out and board squeaking Structural Anchor Hole Layouts: Drilling precise 7 8 inch anchor points in hardened aged concrete foundations to receive heavy mechanical drop in fasteners or heavy duty anchors preventing packed debris friction and thermal degradation during deep hole structural anchoring cycles