The drains are made from very thick slabs by sawing, shaping and subsequent hammering or flaming of the plane with the addition of slits for the discharge of rainwater. 
The overflow drains are made from thick slabs by sawing, shaping and subsequent hammering on the top, creating a cavity length of the sheet of approx. 2 cm for the collection of rainwater.
Kerbing corners are made from slabs by sawing, shaping and subsequent flaming of the external sides (for a minimum of 15 cm). Almost always used in pairs at each end of a driveway, link up curbs on...