Pocomoco 3 Packs Plastic Test Tube Rack, 21 Holes Lab Test Tube Rack Holder for 30mm Test Tubes, White, Detachable (21 Holes)

These are ok but the info said that the holes were bigger than what they actually were. They ended up too small for my needs. They are not a bad rack just need to put the correct size of the holes.

Needed to find a means of holding 6 sample vials other than by hand. Gave these a try as an experiment and they worked wonders. Allowed for proper sample vial filling and great ease of "clean up" (rinsing) when finished. Definitively now part of our sampling procedure. I'm using on the east coast and my colleague was so impressed he took the extras for use on the west coast. Highly recommend.

I use these racks with the RESTCLOUD 16"x16"x24"h butterfly habitat, where one rack fits perfectly, and holds the DEPEPE 50ml Clear Flat Plastic Test Tubes filled with milkweed cuttings. The racks are sturdy and lightweight, and THREE is the right quantity when it comes to cleaning the enclosure...rack #1 in the habitat with the cuttings and caterpillars, rack #2 holding clean test tubes with fresh water, and rack #3 ready to receive the dirty test tubes.The racks are easy to clean with bleach spray, although sometimes a toothpick is required to poke frass from the rack.These racks, along with the aforementioned test tubes and butterfly enclosure, make raising butterflies easy. I highly recommend.

I will keep the item but it's not a great fit for floral tubes. The title says test tubes and the description says floral tubes. I did not notice the descrepancy when I originally ordered. It will work for my monarch setup but isn't a great fit. It barely fits in the enclosure and the floral tubes are very loose. Also you will have to assemble these.

I bought these to hold test tubes. 3 came in one package and they were easy to assemble (folding all the sides before assembly helps speed the process up). They are the perfect size and will work with any size tubes (however I think larger tubes will work best). This is exactly what I needed! Great value for the price!