Scope of application: The wrench suitable for repair tools, buffers and castle nuts AR15 / M4 for quick removal and replacement of buffer tubes, good performance. Convenient: This unique tool combines all the tools needed to remove the need to have several types of keys. It is an integration of many functions that can handle different situations, practical and practical. Premium quality: The key made of high quality steel, firm and stable, durable and long service life. Humanized design: compliant Ergonomic design, easy to grip and use, perfect tool for professional use. Note: Please payAttention to the size of the product before purchasing to avoid the occurrence of model incompatibility. Specification: Condition: 100% brand new Item type: wrench Material: steel Color: Black Suitable for AR15 / M4 repair Size: As shown in the pictures Package List: 1 x Wrench Note: 1. Please allow slight error due to manual measurement. Thanks for understanding. 2. Monitors are not calibrated same,