Poxygrid® 50mL Centrifuge Tube RacksPoxygrid 50mL Centrifuge Tube Racks 50mL Multiple Tube Holders Made of epoxy coated steel wire, these racks hold up to thirty six 50mL centrifuge tubes in holes 30mm square. Heat cured epoxy coating is unaffected by organic solvents, salts, weak acids and weak alkalis Temperature range 223C ( 369F) to 121C (250F); autoclavable No. of Holes ROWS Dimensions (L x W X H, mm) 8 2x4 140 x 76 x 89 (5 7 8" x 3 3 16" x 3 1 2") 16 4x4 140 x 140 x 89 (6 1 8" x 5