Features High Quality 5V 1-Channel Relay Module: This module offers high-quality performance with a 5V power supply and 1-channel bistable self-locking relay, ensuring reliable and efficient . Convenient Trigger Control: Easily activate the relay by clicking the trigger port to pull it in and hold, and click again to disconnect, providing convenient and intuitive control. and Long Service Life: Constructed with high-quality materials, this relay module is and has a long service life, ensuring lasting reliability for your applications. High Accuracy and Strong Stability: With high accuracy and strong stability, this relay module is easy to install and use, delivering and reliable performance for various applications. Safe Low Pulse Trigger: The trigger mode is a low pulse trigger, providing a more convenient and safer for your peace of mind. Features: 1、[DIAMOND MATERIAL] Using excellent diamond material, with high hardness and wear resistance, improve drilling efficiency. 2、[INCISIVE BLADE] The hole opener has a incisive blade, with fast drilling speed, and a smooth cut without burrs. 3、[50MM DIAMETER] The hole diameter is 50mm, the size is standard, and the drilling is accurate and stable. 4、[WITH M4 THREAD] With standard M4 female thread, easy to install, not easy to loosen or fall off during use. 5、[APPLICABLE MATERIAL] The diamond drill bit is suitable for drilling granite, ceramic tile, concrete, marble and other materials. Specification: Item Type: Diamond Drill Bit Material: Diamond Color: Blue Drilling Diameter: Approx. 50mm / 2in Total Length: Approx. 68mm / 2.7in Female Thread: M14 Scope of Application: Marble, granite and other stone drilling Package List: 1 x Diamond Drill Bit Package List 1 x Diamond Drill Bit