Materials: Shelf Stands or Recessed Shelf Stands: Shelves: 18 gauge, stainless steel, type 304, #4 finish Legs: 16 gauge, 1" dia. tubular stainless steel, type 304, bright buffed finish Glides: non-marring Casters: 3" dia., non-marking, swivel ball bearing, zinc plated Retaining Rail: .375" dia. rod stainless steel, type 304, bright buffed finish Construction: Shelf Stands or Recessed Shelf Stands: Shelves: one piece with front, back, and both ends hemmed; hemmed edges are flanged down creating a unitized top and double-thick angle frame; corners are notched to fit the leg contour; unitized shelf and double-thick angle frame's vertical flanges are fully heli-arc welded to the Legs (welds are concealed) Legs: top end capped and fully heli-arc welded; exposed welds are ground smooth and buffed to a smooth, bright polished finish Glides: inserted into bottom ends of Legs Casters: stem-mounted into caster socket with caster socket inserted into bottom ends of Legs Retaining Rail: one piece; total wraparound design; fully heli-arc welded to legs; welds are buffed to a smooth, bright polished finish