The Plank Rite® tool can space wood or composite decking boards. Just flip the tool over for the correct spacing needed. The tool has installation guide holes to consistently install nails or screws along the deck boards. TIP: drop a chalk line down the middle of each beam/stud and follow the line with the "V" in the middle of the tool and you have a perfect straight line of nails or screws on your finished deck. See below example in picture.