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、Quick Cutting: Incisive blade together with 40mm size ensures clean cutting edge as well as high drilling speed. 2、Accurate Work: 130 degree drill tip design enables more accurate positioning, which will improve work efficiency. 3、Practical Use: Allows for wide application on concrete, brick, wall, stone, installation and so on, very useful. 4、Good Material: Adopting premium cemented carbide material with good hardness, with wearing and long uses. 5、Easy to Install: Comes with light weight and compact size, the convenient replacement can be quickly completed. Specification: Item Type: Hole Saw Material: Cemented Carbide Colour: Silver Specification: Approx. 40mm / 1.57in Wide Application: Widely used for cutting clean holes in concrete, brick work as well as drilling wall, stones, installing air conditioners, etc. Package List: 1 x Hole Saw Package List 1 x Hole Saw