Catalog > Internet of Things (IOT) Related Products > More Platforms Ultrasonic Sensor HC-SR04 Fixed Bracket Fixed Ultrasonic Sensor HC-SR04 Bracket GTC ULTRASONIC HC-SR04 BRACKET ULTRASONIC SENSOR HC-SR04 CARTOON FIGURE FIXED BRACKET--SENSOR NOT INCLUDED Discontinued Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features Thickness : 2.8 - 3.1mmInternal diameter : 16mmDiameter of mounting hole : 3.8MMCan be used in conjunction with HC - SR04 ultrasonic distance-measuring module