Lily's Home Bamboo Test Tube Vial Shot Glasses Holder Rack, Great as Pen Stand, Made from Bamboo with Built-in Handle, Rack Only, Glass Tubes NOT Included, 6 Tube Capacity (7/8" (22mm') Holes):
Test tube rack - Wikipedia
12-Place Tube Holder for 12mm Tube Autoclavable PP White Rack Globe 456105
Fisherbrand Locking Test Tube Rack Blue:Racks, Quantity: Each | Fisher Scientific
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SKS Science Products - Test Tube Holders, White HDPE Test Tube Racks
Test Tube Rack, Polypropylene - ScienceKitStore.com
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Wooden Test Tube Rack - Accommodates 6 Tubes, up to 22mm - 9.75" Wide - Premium Polished Wood Construction - Eisco Labs: Amazon.com: Industrial & Scientific
Test Tube Rack For 17mm Tubes 60 Places Red SKU:1300-00365 - Bellco Glass | Laboratory Glassware
BIPEE Plastic Test Tube Rack for 25mm Tubes, 24 Well, White,Detachable (24 Hole): Amazon.com: Industrial & Scientific