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、MAIN PURPOSES: Hollow hole saw specification is 130mm for drilling holes in concrete, bricks or wall, or for cutting holes when installing air conditioner. 2、CEMENTED CARBIDE: Forged with cemented carbide and quenched at high temperature to ensure high hardness, not easy to break when cutting or drilling. 3、GOOD PERFORMANCE: Carbide head blade has the characteristics of high hardness, strong impact resistance and fast drilling speed, effective and . 4、ACCURATE WELDING: Using high frequency welding technology, the welding opening is very firm, and the inner and outer welding ports are smooth and . 5、EASY TO INSTALL: The electric hammer hole opener has standard size, easy to connect and not easy to fall off, which is safe and reliable in . Specification: Item Type: Wall Hole Opener Material: Carbide Color: Silver Specification: Approx. 130mm / 5.1in Uses: Widely used for cutting clean holes in concrete, brick work, drilling wall, stone, installing air conditioners, etc. Package List: 1 x Wall Hole Opener Note: Manual measurement, please allow 1‑2cm error. Package List 1 x Wall Hole Opener