Parallax 28015/570-28015 Combo Ping))) Ultrasonic Distance Sensor & Ping))) Mounting Bracket Kit 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 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).