... 40cm (16inch).Load Capacity: 325 kg/sq.m Special Features value:1,Safety: with patterns on the top surface, it is free ... nails usually found on wooden walkways. Also it has no sharp corners and is stable enough to walk on. 2,Versatility ... : resistant to UV rays, frost, seawater, corrosion, chemicals, and oil. I'm here to provide you more info.,thank you.