The PING))) Protector Stand is a precisely machined mounting bracket cut from ¼ in thick high-grade aluminum. With easy installation this stand can gracefully attach your PING))) Ultrasonic Distance Sensor to your robot and protect the sensor from most collisions. Note: PING))) Ultrasonic Distance Sensor (1611-PLX) is not included. Key Features: Designed to protect your PING))) Ultrasonic Distance Sensor from damage. Hardware to connect sensor to stand is included Custom CNC-machined from 6061 high-grade aluminum at Parallax headquarters in Rocklin, CA. Aperture and plastic light pipe included to allow for visual check of sensor function while mounted to stand. Technical Details: Two 6-32 (0.144 inch Dia.) un-threaded mounting holes Dimensions: 1.95 in x 2.20 in x 0.25 in (11.4 mm x 55.9 mm x 6.4 mm)