Quick-Secure Retractable Tie Down Straps Fts Wheelchair L-Track The WC-RET4 part has been superseded by the K530311-000HL The new generation of the SilverSeries 4-point securement system appeals with its high safety aspect, aesthetic design, functionality as well as high-quality materials. The high-quality cover of the wheelchair restraints is made of zinc die-casting - a material that makes the retractors robust and suitable for daily use in vehicles. The retractors are anchored to the vehicle floor with an L-Track Fitting or a Smart Fitting and can be easily tethered to the wheelchair with a J-hook, carabiner, or loop attachment. The wheelchair restraint system is optimized by using in conjunction an occupant securement system. The SilverSeries is compatible with all wheelchairs and vehicles. Qty 4 Kit includes for L-Track User Manual for Wheelchair Occupant Restraint System is Included L-Track Floor Mount Retractable Tie Down Straps Meets the requirements of SAE J2249 Including a Frontal Impact Test Conducted at 30 mph, 20G using a Forward-Facing Surrogate Wheelchair with a Mass of 85kg and an ATD with a Mass of 76.3 kg. A seat belt and/or shoulder restraint should always be used with any tie-down system. Never depend on wheelchair locks (brakes) alone for safety when driving or being transported.