1.The PO Series hammers are designed with high technology, which are Lighter,Stronger,and more powerful than ever. 2.Special designed chisel pin has improved the durability. 3.Applied more powerful impact power by elaborated design and process. 4.Increased the life of the breaker (Chisel Pins,ThroughBolts,Front Head,etc.) by applyingthe Anti Blank Firing system.