Frames The work shelf is supplied of back-splash on three sides and edge of liquids containing, of push-handle and location of accessories supports. The bottom is shaped to the four corners with bumpers to avoid the accidental contact of castors and frame to the walls. The bottom form avoids stagnation of liquids and guarantees the maximum capacity together with castors, of 440 Kg. Vertical sides are inserted in places made under the work plane and mortised on elevations of the bottom, to avoid infiltrations, liquids stagnation or powder. The fixing is guaranteed from threaded bushes printed in the side. The back of trolley is made of glazed sheet-stainless steel, fixed to the frame by inner screws that can be perforated.