Polypropylene support rack can be autoclaved at 250°F (121°C). Fifty pipets are held in a vertical position in 5 x 10 arrangement. Top and middle decks have holes 16 mm in diameter. Holes in bottom deck are tapered from 16 mm to 6 mm diameter. Hand grips on top at both ends. Size is 8.4"" x 4.5"" x 8.75"" high.