Description: 【Versatile】: Air bits set is compatible with pneumatic air hammers and air chisels, ideal for automotive repair and metalworking tasks 【Material】: Pneumatic hammer bits are crafted from high strength 40Cr material for enhanced wear resistance and long performance 【Efficient】: Extended provide improved reach and efficiency in tight or hard to access areas during work 【Convenient】: Easy to install and replace, making tool changes quick for uninterrupted workflow in professional or DIY settings 【Time Saving Efficiency】: This pneumatic set enables fast and efficient work, significantly reducing the time and effort required for challenging tasks such as bricklaying, rock drilling, and metalworking Specification: Material: 40Cr Size Chart:17.8 cmx2.5 cm/7.01 inchx0.98 inch, 10 cmx3 cm/3.94 inchx1.18 inch, 8 cmx3.5 cm/3.15 inchx1.38 inch Spring: 2.8 cmx2.6 cm/1.1 inchx1.02 inch Package Includes:4 Pneumatic 1 Spring Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.