Product: QRB1 photoresistor type flame detection, oil burner machine parts. Material: This Flame Detector is made of PP material that ensures durability and long term performance. Product Size: The product measures 50cm in length, making it a suitable fit for your oil burner machine. Feature: This sensor is designed to detect flame efficiently and accurately, enhancing the safe and efficiency of your oil burner machine. It's an essential part for maintaining the optimal operation of your equipment. Usage: QRB1 Photocell Resistor Flame Detection Sensor for burner waste oil. Specification: Material: PP Size Chart: 50cm/19.69inch Package Includes: 1 PieceQRB1 Flame Detector Note: Please allow slightly errors 1-2cm differences due to manual measurement.