Height adjustable with fixing pin. - The user must insert the fixing pin into the holes in order to support the sliding tube in the chosen position. - The stands are composed of a central tube, fixing pin, support feet, load support saddle, adjustable load. - The trestles must be used exclusively on flat, smooth support surfaces of adequate hardness and resistance (capable of supporting the total weight of the trestles and the maximum nominal load). Do not exceed the maximum capacity of 2 tons indicated by the manufacturer. - The environment must also be sufficiently illuminated to ensure operation in maximum safety (at least 50 lux recommended).