This fastening is intended for beams with a square cross-section. Facilitates the assembly of ladder rungs and elements of side panels and railings. Now you do not have to take the whole ladder for assembly, it can be assembled on site. Hole for tube: Φ35 mm. They are produced in 4 basic colors - yellow, red, blue, green; but at customer's request we will make any other color. Material: Polyamide PA6.