Underpart made of square tube 30x30x2 mm, chromed. Tread made of polyurethane, coloured black. Measures: Height: 150 mm, Tread-size: 550 mm x 300 mm Weight: 4,5 kg Step Model 320-01 Like Model 319-01, difference: Height: 250 mm, Weight: 5 kg Double-step Model 321-01 Underpart made of square tube 30x30x2 mm, chromed. With 2 treads, treads made of polyurethane, coloured black. Tread-size each: 550 mm x 300 mm Measures: Height: Step 1: 230 mm. Step 2: 460 mm Measures overall: L: 560 mm, W: 300 mm, Weight: 11 kg