Internalsize: 1950*830*360/640mm Externalsize: 2150*930*360/640mm Backrest: 0-70 knee rest: 0° -35 Hi-low: 360-640mm @ The bed surface is shaped one for all by imported cold rolled steel plate and is stable and realible. @ High quality ABS and MFC engineering plastic bed head and tail are beautiful and generous, freely install and removed and stable. @ Strongly stable and non-noise full-braked truckles. @ Bed corners are equipped with anti-bump cushion devices. Demark LINAK safty voltage electric motors and non-stop uninterruptible power device