Modular system: Frame made of sturdy square tube. Cross beams, posts and bars connected with solid screwed joints. Carrier spars made of tubular steel Ø 27 mm with screwed joints. With 12 one-side carrier spars. Carrying capacity per level 80 kg. Powder coated blue RAL 5007. 2 swivel and 2 fixed-wheel castors, TPE tyres, hubs with groove ball bearing. Swivel castors with wheel locks, according to EN 1757-3.