Lock on button for constant convenience. Offers highest power-weight ratio, 620W at 1.7kg. Offers combination power of 620W and airflow of z 3.5m3/min. Easy to change carbon brush. Removing the accumulated heavy dust on air coolers manually is a tedious task. Buy this extremely handy air blower GBL 620 from Bosch and complete the task with ease. Ventilation grills at homes and industries are often dusty. Manual cleaning would consume more time and effort. GBL 620 air blower from Bosch allows you to do these tasks in less time effortlessly. Removing wood dust manually in a furniture manufacturing industry is gigantic task. Bosch GBL 620 is an ideal tool for such heavy cleaning as it is handy and easy to use.