Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U1 (Pack of 50)

This isn't a hardy product but it is good enough for shelf storage and a very good value at its price. The plastic is somewhat brittle but plenty strong to occassionaly move around. Easy to assemble.

excellent to have for extra storage to use with all my scentbird perfume bottles. the travel sizes are small glass viles and i never know how to store them. they look super cute and i like how there is another layer to hold the bottom and mid section of the bottle. i truly could not find anything i was willing to pay, and certainly refuse to buy the actual perfume holders from the official scentbird. its not that flimsy, but i would also not describe as sturdy. still a five star product for myself & needs personally! very happy ♡

I got this to use for holding test tubes for my aquarium API tests. It works great. There are no instructions but basically, you just slide the racks into the little stands. The backside of the shelves have 2 little clear dots to stop from sliding too far. Once I got the first one on (the bottom rack), the others were easy. I did put a drop of cooking oil on the stand where you slide it on, as they wanted to hang up. And one I had to slide back and forth a few times until it would slide on easily. You just have to remember to put the side without the clear dots (stoopers?) in first. It's not real sturdy, but plenty enough for holding test tubes. Well worth the $6.49 I paid. It is larger than I need, but it will make the process so much easier. I guess if you wanted it a little more sturdy you could put a drop of glue on the stands. But not necessary at all. They hold well, even when carrying empty. I wouldn't carry it full of test tubes.

I bought this test tube rack for holding ink samples from Goulet Pen's Ink Drop program. I like that it holds 50 samples instead of the 40 that Goulet's model holds, and honestly, I'd have to guess that the same manufacturer makes both models. Because there are five rows per column and because each drop contains five samples, too, it's super easy with this rack to organize your samples by month. I love that!Some criticisms of this model claim that it falls apart easily if you try to move it, but I've found that that's not really the case for me, especially if there are tubes in any of the slots. Because the tubes actually go through the holes in the first and second layers, a tube acts as a sort of "pin" holding both layers together. The fit of each layer into the slots of its holders, too, is quite snug and not likely to come loose. I can pick my model up and wave it around all day long without it coming apart. However, if your fittings are lose, a small tab of glue on the open ends of each slot can lock the inserts into place permanently. For the price, I find just a wee bit of DIY totally acceptable for using this thing to its fullest potential, but hey--for $6, I'm happy the thing will just sit still on my desk without falling apart. Plus it looks nice.I do wish the manufacturer would include slots on the top of each side holder and pegs on the bottom, placing them so they interlock if stacked. I think there's actually enough clearance on the bottom of this unit that I could stack them on top of my ink samples, if only the one on top could be secured so it doesn't slide around. And the quality control on these clearly isn't all that great. My unit arrived with a tiny crack in the bottom shelf and slight irregularities in the slits that made assembling the thing a little tricky. Had it gone the opposite way, with irregularities that made the thing too loose instead of too tight, I can see how that could let the shelves slide out too easily. Again, though--$6.All in all, a wonderful solution for storing sample ink vials. I like it and would recommend it especially to those who keep lots of samples on hand or are subscribers to the Ink Drop program.

These are 1/3 of the price of those from my favorite pen & ink supplier, and they're better: these have a bottom layer that makes it possible to lift and move this rack while vials are still open. The pen supplier's rack has dumped out uncapped vials I was working from, because I needed to move the tray and didn't remember this flaw. I've got a few of these now, and they're sturdy. Not furniture sturdy, but I caught myself leaning on one and it didn't break. Not advisable, but good to know. They do flex a bit, but no mishaps.Be sure to align the 3 layers correctly and smooth side up before installing. The layer with small holes goes at the bottom. You can only install them from one side.

Actually purchased this for my scentbird tubes! They send me perfume samples each month and after a few months they were starting to gather up and roll around my bathroom, so I needed some way to store them. this works great, and the size is a bit loose for them but otherwise perfect.

This rack is great for fountain pen ink samples. It can be a little difficult to slide the three rack levels into place, but not enough to avoid getting it (they are all this way, from my experience). And I wouldn't want to stack anything heavy on one, but they hold up to a full 50 samples of 5ml. I've got 5 of these now.

Took me a little while to assemble, but once done, holds well. I organized by seed beads that came in the 15 mm vials. Very handy.

I was looking for something to hold my essential oil pipettes. Got two of these, gorilla glued the edges, left a heavy book on it for 24hrs and viola! Instant pipette holder. Will order more, as I've pretty much filled up this one lol..Update: so I ended up ordering another two, but I didn't like having two separate holders, so I again used the gorilla glue to glue all four together. Easy Peasy

Just want to thank you the stand is really sturdy and nice looking easy to assemble.. so pleased can do my api tests without the test tubes breaking and rolling away!!!

I bought this to hold tubes of seeds beads and it works perfectly! Nice and sturdy and can take apart again if need be

I love this it works great