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、13 Sizes Hole Saws: This professional hole saw set includes 13 sizes of hole saws, twisting drill bit, extension rod, positioning drill bit, thread converter and hex wrench, meet your different needs 2、Universal: This hole cutter kit fits all brands and sizes, used to simplify diameter changes with quick removal plugs and tool less installation 3、High Performance: Hole saws have alternating tooth sizes that can improve performance, which has faster cutting speed and longer in use 4、Equipped with Storage Box: The set comes with a storage box, these hole cutting tools are easy to store and carry, convenient for use when working outdoors 5、Application: This hole drill tool kit is ideal for drilling holes in sheet metal, wood, plastic, plasterboard, aluminum, etc. Specification: Item Type: Hole Saw Kit Material: High speed steel Hole Saw Specification: Approx. 19mm/0.7in, 20mm/0.8in, 22mm/0.9in, 25mm/1in, 29mm/1.1in, 32mm/1.3in, 35mm/1.4in, 38mm/1.5in, 44mm/1.7in, 51mm/2in, 57mm/2.2in, 64mm/2.5in, 76mm/3in Package List: 13 x Hole Saw 2 x Twisting Drill Bit 1 x Extension Rod 2 x Positioning Drill Bit 1 x Thread Converter 2 x Hex Wrench 1 x Storage Box Note: Pay attention to the correct . Package List 13 x Hole Saw 2 x Twisting Drill Bit 1 x Extension Rod 2 x Positioning Drill Bit 1 x Thread Converter 2 x Hex Wrench 1 x Storage Box