QRT MAX L-Track 4 Retractor Kit Package includes (4) QRT MAX L-Track Retractors Designed for transit & Paratransit buses, crash tested at 30 mph (50 km/h) Red-line safety lock indicator For creating a 4-Point mobility securing system Meets or exceeds all SAEJ2249, ISO 10542, FMVSS 209,210,302,222, cmVSS 209, CSA Z605, AS2596 and ADA requirements