The CAMO Hand Drive EDGE Fastening System is a quick and easy way to achieve a fastener-free surface when installing square edge deck boards. The system includes MARKSMAN Guides, EDGE deck screws, and driver and pre-drill bits. The heavy-duty contractor-grade tools clamp to and space the boards, while perfectly lining up the screw guide holes on the joist. Once you place the tool on the board, drop in two EDGE screws, and fasten.