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、Made of high quality diamond material with high hardness and durability 2、Strong hole opening performance, fast drilling speed, smoothly and seamless 3、Adopt high？quality brazing technology, smoothly opening without broken edges, no vibration 4、Suitable for drilling holes in marble, concrete, granite, tiles, glass, etc. 5、Small size, easy to carry and store, convenient to use and with good performance Specification: Item Type: Diamond Hole Saw Drill Bit Color: Blue Material: Diamond Size: Approx. 83 x 25mm / 3.3 x 1in Maximum Opening: Approx. 25mm / 1in Uses: Suitable for drilling marble, concrete, granite, ceramic tiles, glass, etc. Size: Approx.25mm / 1in, 58mm / 2.3in Package List: 1 x Diamond Hole Saw Drill Bit Note: Manual measurement, due to manual weight measurement, please allow 1？m error. Thank you for your understanding. Package List 1 x Diamond Hole Saw Drill Bit