BBel-Art Scienceware Grid Set for Switch-Grid Test Tube Rack, Yellow Color, 25-30mm Tubes (Pack of 4) ReviewbP PP Bel-Art Scienceware Grid Set for Switch-Grid Test Tube Rack, Yellow Color, 25-30mm Tubes (Pack of 4) PSwitch-Grid Test Tube Rack system is more compact and less expensive than purchasing multiple racksPSwitchable grids allow user to utilize two tube sizes in one rack; change grids in one side or both (2 grids needed per side)PYellow grids fit 25mm to 30mm tubes; rack capacity: 12 tubesP