This is the perfect crash rail for high abuse environments.Alarm & Security Systems This 8" (203.2mm) high Zebra Acrovin crash rail is available in surface, bumper and extended mounting options with a continuous cushion for additional shock absorption. Surface mount applications utilize standard 1 1/2" (38.1mm) wide aluminum Test Instrument clips or optioSmart Card & Card ReaderIndustrial Adhesive Products nal cTransmitter ontinuous aluminum retainer. Bumper and extended mount applications utilize the continuous aluminum retainer.