They accentuate aesthetic values and they are irreplaceable in places exposed to direct weather conditions. They are produced from medium grained granite. Its frontal surface and sides are cut. The surface treatment includes adding anti-slippery finishing. The products are divided according to the surface roughness into:
- polished – steps finished in this way are characterised by high smoothness. Stone has natural shine. The surface is relatively slippery. The acceptable coarseness ranges from 0.0025 to 0.02 mm. It is the most popular finishing, showing natural stone values and the full spectrum of granite shades.
- ground – in this case the surface has distinctive coarseness. There are scratches after the use of abrasive materials while grinding. The acceptable depth of a scratch in case of rough ground structures is 1.5 mm; for preliminarily ground surface 0.3 -0.5mm and fully ground ones 0.1 -0.3 mm.
- sandblasted – much appreciated structure, created by the operation of forcibly propelling a stream of sand material against a surface under high pressure; the surface is even and coarse.
- flamed – the texture is similar to naturally chopped surface. The coarseness of the surface depends on the diameter of quartz grains which undergo heat treatment.
The edges can be finished straight or quarter bullnosed. The thickness of steps is 14, 15, 16, 17, 18 or 20 cm.