The decking screw has a cutter tip that makes it possible to screw close to the end wood without cracking the board. The screw is also waxed for reduced friction and easier tightening while further enhancing the corrosion protection. The stainless steel screw is slightly softer than a C4 screw and makes it more flexible when the timber dries or moves. The "perfect fit" bit grip gives you the best contact between bit and screw. Calculation of consumption To calculate how many screws you need for your project, you need to know the width of the timber and your intended rule distance. Below you can see the consumption for the most common dimensions and distances. Width of timber / Rule distance / Number of screws/m2 95 mm / 600 mm / 34 pcs 120 mm / 600 mm / 28 pcs 140 mm / 600 mm / 24 pcs