Pupils' chairs on metal frame type II adjustable numbers 3-5, 5-7

The lower part of the frame in the form of two support elements and posts made of flat-oval tube with a cross-section of 49 mm * 29 mm, wall thickness 1, 9 mm. The props of the lower part are rigidly connected with each other by a lintel made of flat-oval tube with a cross-section of 39 mm*19 mm, wall thickness 1, 5 mm. The length of the lintel is 325 mm.
The upper posts are made of 39 mm*19 mm flat-oval tube with a wall thickness of 1, 5 mm.
The base for the backrest and seat are made of 20 mm*20 mm, wall thickness 1, 5 mm. Height of the vertical post 270 mm. Backrest plugs are 70*40*52 mm. The plug has a semicircular shape and tightly encircles the pipe, gives the frame an aesthetic finished look. It is adjustable by screw connection of the legs and can be adjusted to the required height group. The place of the joint between the legs and the frame is reinforced with a plastic insert, 2mm thick, installed in a pipe with a depth of 100mm, has a flap to avoid falling into the pipe. The backrest and seat are made of double-walled structured plastic.