This pneumatic needle scaler pistol grip with 19 high wear resistant steel needles is an indispensable tool for any workshop or DIYs. It is ideal for surface preparation work including the removal of rust and cleaning of welding slag, splashing spots, paint, plaster, stone carving and concrete, etc. Warm Reminder: the needles are replaceable since pneumatic needle body and the needles can be separated. So you need only to buy replacement needles if they are broken. Please note the replacement needles are not included in delivery.