... , castors, crank control,function of backrest & footrest,HI/LO adjustment ABS Hospital Bed with Three CranksModel Number:SLV-B4030Specification:2120*970*450 ... bed frame, aluminum alloy side rails, ordinary castors, three cranks,ABS board of bed head and foot.3. The bed surface ... , net-shape bed board, bar-shape bed board, lifting pole. ABS Hospital Bed with Three Cranks