1. Improved Accuracy: The gauge housing kit is designed to enhance the accuracy of bottleneck measurements, allowing for precise assessment of changes during firing or resizing brass. 2. Compatibility: The headspace gauge housing kit serves as a replacement for 330, C375, D400, B350, and E420 models, ensuring proper fit and function for checking a wide range of bottlenecks. 3. Efficient Measurement: Easily determine the correct case diameter by combining neck and shoulder measurements to achieve optimal case matching and streamline the reloading process. 4. Versatile Use: This headspace gauge is ideal for measuring fired or resized brass and delivers accurate results across various reloading applications, making it a valuable tool for precision reloaders. 5. High-Quality Materials: Constructed from high-strength metal, the gauge housing kit offers reliable performance and consistent accuracy, meeting or exceeding OEM standards. Specifications: Item Type: Gauge Housing Material: Metal Fitment: Compatible with 330, C375, D400, B350, and E420 models, used for checking most bottleneck cartridges Package List: 1 x Headspace Gauge Kit (9 pieces)