Allows these chocks to quickly and securely attach to the E-track on any trailer platform and position the chocks anywhere along the track for maximum flexibility Designed to be used with either Condor« Pit StopÖ/Trailer StopÖ, Condor« Simple Chock Trailer or the Condor« Chopper Chock Includes Boomerang bar for added stability and hardware. CHOCK E-TRACK ADAPTOR
