The Safe Three have been assuring the safety of thousands of merchandising staff over twenty-five years, loading shelves in supermarkets, libraries, shops of all types, stores and anywhere safety is needed to place stock, products or records easily and safely upon shelves. The secret is a simple as it is effective -stand on an SMI Safe Two Step trolley and you are immediately safe. The minute you pull down the steps the wheels are automatically lifted at the step end and your weight anchors the unit to the floor so you can safely stand on the steps. Returning the steps to their wheeling position will allow the unit to glide easily on its four swivel wheels to the next location. No wonder Health & Safety officials love this effective unit. The Safe Three Step Trolley has an additional handrail because it is slightly higher but carries the same maximum safety features of the Two Step Trolley.