... *55 Beam,P50*30,P60*40,P80*50,P110*50 Multi-tier Rack Racking Shelf Shelves:Its standard is ormally the ... also provide staircase for warehouse personnel to travel around.Walk way width is about 900-1100mm,Manual pick can reach up ... upper floor is easily reached by staircase elevator,and slide way or loading platfor.It is good for storage of small ...