This rugged polypropylene rack holds 48 vials, size 1 dram (15 x 45 mm), or 4 ml tissue culture vials, or 2 ml serum vials in 4 x 12 configuration with alpha-numeric indexing. The rack is constructed from chemically resistant, autoclavable (121°C for 20 minutes) polypropylene and features corner posts to assure stability when stacking empty.