Pupil's chairs with metal frame type II adjustable numbers 4-6; 5-7

The chair has a base: made of profile pipe 25*25 and 20*20 mm, wall thickness 1,5 mm. Two support elements and lintel. The support elements are curved with a radius of 1200 mm and are supported on the floor covering by a decorative polyethylene cap-substopper. The supports are rigidly connected to each other by a lintel. The chair lifting mechanism is made in the form of two posts, adjustable by unscrewing the nuts and setting it to the required height group. The chair posts are made of pipe. The ends of the pipes are closed with plugs. The backrest and seat are made of vandal-proof double-sided breathable high-density polyethylene (HDPE). The backrest and seat have internal stiffeners in the form of through holes. The number of ribs on the backrest is 21. The number of stiffeners on the seat is 20. The plastic backrest has an ergonomic opening for gripping and moving the chair. Fastening is made by means of a concealed screw connection (not through). The width of the plastic seat is 380 mm, the depth of the plastic seat is 360 mm...