The Revolver X2 Aluminum with Vinyl top bed cover comes equipped with 3/4in Patented Rotational Locking Rails that lock the cover securely the full length of the bed. The 3/4in locking rail or "tooth" rotates into composite locking blocks inserted into each aluminum slat. The cover secures automatically when the spring loaded locking levers are engaged as the roll top is closed. *400lb capacity *Easy to use automatic slam latch operates from either side *No lifting with easy one-handed rolling design *Easy clamp-on installation *No Velcro or stitching *100% bed access *Tough security *Full access to stake pocket holes for other accessories *Extended 3-year warranty