The installation process is simple and doesnot require complex tool to complete the conversion, suitable for 9mm square handle four pit drill bit Carbon steel, it have high hardness and strong wear resistance, ensuring stable operating under high load and extending its service life Suitable for mainstream electric tool on the markets, it can be used for drilling holes in brick, concrete, stone, and other materials This conversion head can transform electric wrench into impacts drill, endowing the electric wrench with chiseling ability, meeting different work needs, and enhancing the practicality of the tool The weight is only 140g and the size is 59x25mm. The small size design makes the conversion head easy to carry and suitable for home users and professional technicians, Manufacturer: HVRFJXI