40 Holes Plastic Test Tube Racks Consumables This 22-layer/11-layer model (two complete

This 22-layer/11-layer model (two complete turns of the double helix) is designed for self-assembly

Compact folding magnifier with fixed scales with scale and measurement in inch and mm units leaves both hands free

If you need a custom order with different sizes

made from steel

Excellent for frieze work

40 Holes Plastic Test Tube Racks Consumables This 22-layer/11-layer model (two completeIncluded: Lab Rack 40 Test Tube Holes No Wire White Color Holds 40 Tubes. Premium Quality: Plastic test tube racks are made of sturdy plastic, non toxic and eco friendly. Designed for use in professional laboratories but is an ideal choice for science classrooms and household use. If you need custom order with different sizes design, please contact us.