Home » News » 4ml Sample Vials » white graduation line storage 4ml vials specification white graduation line storage 4ml vials specification Vials, Racks, Holders, and Lyophilization Containers 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 configurati