Guardian FABX1-LE ANSI Leading Edge Self-Retracting Lifelines provide extreme confidence by utilizing superior technology and craftsmanship in each unit to ensure that the user has maximum safety while working at height. The computer-calibrated and serialized digital braking technology is unparalleled, with each brakes torque setting being individually set for optimum performance. The locking mechanism is designed to prevent nuisance lockups for increased productivity and automatically engages in the event of a fall while simultaneously activating an impact indicator to verify a fall has occurred. The FABX1-LE ANSI housing is made of a tough polymer with recessed areas and smooth contours to protect labels and reduce size without compromising functionality. The unique shape of the lightweight thermoplastic housing provides an exceptional strength-to-weight ratio for ease of installation. This combination of high performance materials and a fully engineered design keeps the FABX1-LE ANSI both lightweight and durable. The FABX1-LE ANSI has been tested and approved in a controlled facility for safe use over an edge with a 0.005 in (0.13mm) radius or above, this however, does not negate the need for edge protection. Use over an edge should always be avoided where possible.