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、Suitable for brick walls, red bricks, foam bricks, hollow drills, etc., can be used to install air conditioners, range hoods or washing machines 2、Carbide core drill core is welded with high quality alloy, for a long service life 3、Combination of round alloy blades, each blade bears part of the workload, and cutting edges are not easy to appear 4、The kit includes 30mm, 40mm, 50mm core bits, and 350mm extension shank, easy to install 5、The product possess stable structure, excellent performance and long service life Specification: Item Type: Concrete Wall Cutter Drill Bit Material: Overall: Carbon steel, Drill Core: Cemented carbide Handle: Round handle Hole Saw Diameter: Approx. 30mm / 1.2in 40mm / 1.6in 50mm / 2in Handle Length: Approx. 350mm / 13.8in Package List: 3 x Hole Saw 1 x Handle 1 x Drilling Core 1 x Wrench 1 x Screw 4 x Storage Box(random color) Note: Do not use steel, tiles and stones. Package List 3 x Hole Saw 1 x Handle 1 x Drilling Core 1 x Wrench 1 x Screw 4 x Storage Box(random color)