Designed to protect your PING Ultrasonic Distance Sensor from damage Custom CNC-machined from 6061 high-grade aluminum Two 6-32 (0.144 inch Dia.) un-threaded mounting holes RoHS Compliant The Parallax Ping Ultrasonic Sensor Protector Stand is a precisely machined mounting bracket cut from ¼ in thick from 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. Features: Designed to protect your PING Ultrasonic Distance Sensor from damage 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. Two 6-32 (0.144 inch Dia.) un-threaded mounting holes Dimensions: 1.95 in x 2.20 in x 0.25 in (11.43 mm x 55.88 mm x 6.35 m Note: PING Ultrasonic Distance Sensor (#28015) not included.