Unit shall be of fully welded stainless steel construction. Top shall be of 18-gauge stainless steel with two reinforcements of .104 x 1″ x 1″ stainless steel angle. Under shelf shall be of 18-guage stainless steel. Upright legs shall be of .104 x 1″ x 1″ stainless steel angle and shall be welded to top and under shelf at all points. Mobile Models: Casters shall be 4″ swivel with 3″ stem mount. Two casters shall have brake. Stationary Models: Threaded feet shall be adjustable for floor leveling.