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 PURPOSE: Hollow hole opener, with a specification of 110mm, used in electric hammer and impact drills to open holes in brick walls, pipe holes, etc. 2、CEMENTED CARBIDE: Forged with cemented carbide, quenched at high temperature, has incisive edge and high hardness, and is not easy to break when cutting. 3、GOOD STABILITY: The hollow hole saw connecting rod is heat treated, which does not break during use, and has better stability when drilling. 4、WIDE APPLICATION: Used for cutting clean holes in concrete, brick work, drilling walls, stones, installing air conditioners, etc., with strong practicality. 5、EASY : The electric hammer hole saw has a standard size, easy to connect and not easy to fall off, which is safe and reliable in . Specification: Item Type: Electric Hammer Hole Saw Material: Cemented Carbide Color: Silver Specification: Approx. 110mm / 4.3in Applications: Widely used for cutting clean holes in concrete, brick work, drilling wall, stones, installing air conditioner, etc. Package List: 1 x Electric Hammer Hole Saw Note: In order to help buyers choose a more suitable specification, the concrete hole saw and the connecting rod with the center bit are sold separately, which is convenient for the buyer to mix and match freely. Package List 1 x Electric Hammer Hole Saw