Test Tube Rack, Economy Choice- Chemistry | Flinn Scientific
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):
Full Size 16mm Test Tube Rack 72-hole, Pulmolab.com
Test tube rack, 60 holes Ø 16 mm, blue - Laboratory equipment
Tube Rack (Test Tube Rack) - Science Equipment used in School and Education - Preproom.org