Test Tube Rack, Plastic, 15/18mm, 50 Holes, Karter Scientific 208U2 (Single)

30mm Plastic Test Tube Rack, White, Karter Scientific (Pack of 2)

Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50,...

29 or 80 Place Round Hole Flipper 4-Way Test Tube Holder Rack Vials up to 28mm

8-Place Test Tube Rack 13 mm Holder | Lab Vial Tube Organizer – Made in USA

(Lot of 5) Laboratory Plastic 80-Place Vial Test Tube Holder Rack 11mm ID Handle

19-Place Honeycomb Hexagonal Test Tube Holder Rack for Tubes, Vials Up To 18mm

Laboratory Unbranded 96 Place Microcentrifuge Tube Vial Rack 11mm