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、6 pieces countersink drill bits of different sizes from 6mm to 19mm, meeting your various needs. 2、Standard 1/4in hex shank, suitable for many drills, such as hand drills, rechargeable drills, etc. 3、Suitable for hole opening and chamfering of boards with low hardness such as wood and plastic boards. 4、Five-blade grooved design for better chip removal, high-carbon steel drill bit, not easy to be dull. 5、The plated is rustproof, thus the drill is more beautiful and has high hardness. Specification: Item Type: Countersink Drill Bit Product Material: High Speed Steel Application: Suitable for opening and chamfering of boards with low hardness such as wood and plastic boards. Specification: Approx. 6mm / 0.2in, 8mm / 0.3in, 9mm / 0.4in, 12mm / 0.5in, 16mm / 0.6in, 19mm / 0.7in Shank Type: 1/4in Hex Handle Package List: 6 x Countersink Drill Bit Package List 6 x Countersink Drill Bit