Simpson PRO300SG2 Auto Feed Decking Attachment for Decks Docks Subfloor Sheathing Fiber Cement LGT Light Girder Tiedown 3 edge design means each knife 3 edge design means each knife delivers multiple full cutting lives before replacement a practical way to lower tooling costs per linear foot of moulded profile without sacrificing cut quality properly fitted connection without modification The Simpson Quik Drive PRO300SG2 Decking Attachment is a professional auto feed screw driving attachment built to handle high volume fastening across a wide range of structural applications including deck boards on decks and docks Trim Head: Type 17 Point