For use with treated and other softwood lumber. Dual screw guides fasten both sides of board with single tool placement. Clamping action grips deckboard. Heavy-duty contractor-grade tool. CAMO Marksman tools are designed to use with CAMO hidden fasteners only. No. 345002: Fits Deckboard: 5-1/4 to 5-3/4 Automatic Spacing: 1/16 Dimensions: 2.4 W x 8 H x 9.5 L Weight: 2.1 lb Pkg Qty: 1 Package Type: Box