Stairs trapezoidal type "ground" is an offer for use in residential construction or municipal buildings, commercial, utilities, etc. The advantage of the set is the ability to modulate the amount through the use of 1, 2, 3, 4, or 5 degrees at the proposed height of 17 cm each and the shape and size of each blend in the building, allowing free use of their surface. The company carries out special instructions customers after previous arrangements to the changes and the possibility of their execution. To the extent you can mount the windshield wiper of the company's offer and execute "insert" in the opening frames.