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 don't have to take the whole ladder for assembly, you can fold it in place. Hole for tube: Φ25 mm. They are produced in 4 basic colors - yellow, red, blue, green, but at the customer's request we will make any other color. Material: Polyamide PA6.