http://www.bohle-group.com/shop/catalog.php?id=2943

Glass Carrying Device Tragboy

Suitable for transporting sheet material – the load is held firmly between two non-slip, rubber lined clamps – the heavier the load, the greater the clamping pressure – opening range up to 25 mm (app. 63/64″) – 80 kg (app. 176 lbs) carrying capacity per pair