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、Fast Drilling Speed: This hole opener has a pointed head, fast drilling speed, and a large displacement cutting design 2、Support Customized Drills: This is a hole opener that can improve work efficiency, and can support customized drills 3、Diamond Material: Hole opener is made of high quality diamond material, with fast drilling speed, saving time and effort 4、Long Service Life: This is a hole opener, with long service life, which is cutting smoothly, and without chipping 5、Wide Applications: This is hole opener suitable for drilling granite, ceramic tiles, concrete, marble and other materials Specification: Item Type: Diamond Hole Saw Material: Diamond Colour: Blue Opening Aperture: Approx. 20mm / 0.80in Total Length: Approx. 68mm / 2.68in Internal Thread: M14 Scope of Application: for marble, granite and other stone openings Package List: 1 x Marble Hole Saw Package List 1 x Marble Hole Saw