boscaro presents to tHe Most BOSCARO E PRESENTE IMportant InternatIonaL eXHIbItIons ALLE PIU GRANDI FIERE MONDIALI The secondary positive holding device shall prevent the release of the complete load or any loose parts of the load. For handling loose mate- rials (e.g. bricks and tiles) the secondary positive holding device (e.g. nets or cages) shall not have side and bottom openings of more than 50 mm square. Note It is recommended that the secondary positive holding device is automatically activated.