System accessory GDE 162. The GDE 162 Professional dust extraction system is Bosch's practical and universal solution for core drilling with large diameters up to 162 mm. It enables clean working, reduces cleaning times, and increases user safety. It can be quickly and easily attached to walls, adjusted to various working positions, and used in wet environments – all of which ensures comfortable and flexible working. It is designed for use with the Bosch Click & Clean System.