Quality Material: Crafted from sturdy steel, this Core Drill Bit Adapter ensures long-lasting performance and reliability in various applications Precised Thread Conversion: Core Drill Adapter is designed to convert M16 or M22 threads to 1-1 or 4-7, making it versatile for different threading needs and compatible a wide range of equipment Compact Size: With a length of 85mm, this Thread Adapter for Diamond Drill Core Bits is compact yet efficient, allowing for easy installation and integration into your existing setup Improved Drilling Precision: Enhance the accuracy and efficiency of your drilling operations with this essential core bit adapter Versatile Application: Ideal for use in industrial settings or DIY projects where specific thread conversions are required, providing flexibility and convenience Size Chart: 8.5cm or 3.35inch Package Includes: 1pc M16 to1-1 or 4"-7Core Drill Adapter or 1pc M22 to1-1 or 4"-7Core Drill Adapter with 3pcs Rod Note: Please allow slightly errors 1-2cm or 0.39-0.79inch differences due to manual measurement.