1. The Nutsetter Power Bits - 29163 are designed with a 9 or 16' female hex. This precise size allows for easy and accurate fitting into corresponding nuts, ensuring a secure connection. 2. These power bits are built to withstand high torque applications. They are made from durable materials that can handle the stress and pressure during use, providing long-lasting performance. 3. The female hex design enables a firm grip on the nut, minimizing slippage and ensuring efficient work. It allows for smooth operation when tightening or loosening nuts, saving time and effort. 4. With the 29163 model, users can expect consistent results every time. The bits are engineered to deliver reliable performance, making them suitable for a variety of nut-setting tasks. 5. They are a great addition to any tool collection, whether for professional mechanics or DIY enthusiasts. The Nutsetter Power Bits - 29163 convenience and precision in nut-related work. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.