Drains are made from very thick slabs by sawing, shaping and subsequent hammering or flaming with the addition of slits for the discharge of rainwater. 
Overflow drains are made from very thick slabs by sawing, shaping and subsequent hammering, creating a concavity of about 2 cm along the slab for the collection of rainwater.
Kerbing corners are made from very thick slabs by sawing, shaping and subsequent flaming of the external sides (for at least 15 cm). ). Used almost always in pairs at the end of roadways, they...