Slate stairways are durable and robust. To guard against slipping, most stairways feature the rough, as-cut surface finish. The step edges are ground and bevelled, as are the tops in some stairway designs. Standard thickness for steps is 3 cm, but other thicknesses are, of course, available. Stairway risers have a standard thickness of 2 cm. Production to templates for spiral stairways and curves.