Features:1. Made of premium movement, sturdy to use.2. Exquisite workmanship and dependable performance, it is a great tool for you.3. Wear proof aluminium alloy body ensure long service life.4. Reinforced alloy cylinder provides large storage capacity and strong strength.5. Powerful pull spring is elastic which can effectively reduce vibration.6. Suitable for casting sand cleaning and welding front opening groove, welding slag, flat solder scar, correction of stone, concrete and brick wall opening work.Specification:Impact Number: 4500rpmAir Consumption: 114L/minWorking Pressure: 6-8KGCylinder Stroke: 150mmInlet Port: 1/4"Blade Shape: HexWeight: Approx. 1539g / 54.3ozScraper Knife Length: Approx. 12cm / 4.7inPackage List:1 * Air Hammer 4 * Scraper Knife1 * Inlet Port (Fitting Thread Length Random)1 * SpringNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering..