Specifications BPM: 2100 Air Pressure: 90 PSI Air Inlet: 1/4'' Air Hose: 3/8'' Number of pieces: 25 PCS Compatible with: 150/190/250 pistol air shovel Material: Chrome molybdenum steel through quenching process Features: How to work: The pneumatic action provides a powerful blow, capable of effectively crushing concrete, removing tiles or shaping metal surfaces. Powerful Performance: The air hammer adopts spring-free joint, which has high efficiency, allowing for quick locking and unlocking. .