It can fit one socket just fine, but if you put in a socket that is 1 mm smaller in the adjacent slot, it won't fit! Apparently, the slots are sized in 1/16 inch (1.5875mm) increments rather than in 1mm increments.

I have the Red Lisle 3/8" Magnetic Socket Holder and the Black Lisle 3/8" Magnetic Socket Holder. Purchased here by Wifey. The magnet socket holders look great and hold the entire set of 3/8 shallow and deep sockets. The back magnet will hold the organizer to the side of the cabinet with no problem. The Shallow sockets fit and hold great with no problems. BUT, the deep sockets are to heavy for the magnet to hold them well. If you carry it by the handle the larger sockets fall off as you are moving it. The only reason I wanted the organizers was to have the sockets on one rail to take with me. Pretty much makes it useless for what I wanted them for.

These work really well for organizing, storing, and accessing sockets. The holder lays flat in the toolbox drawer, so you can use these in shallow drawers. I use drawer liners, and don't have any problems with picking up the entire holder (i.e. it doesn't get stuck to the drawer). I personally don't stick them to the side of the toolbox, as I don't want to risk any sockets falling out / getting bumped. The magnet is good for holding the sockets in place, but if you drop it, or bang it on something, then be prepared to chase a few. I haven't really had any problems with this though. There is room to mark or label the socket size (using permanent marker), which makes finding the socket you're looking for really painless -- and makes putting them away simple. If you have an apprentice/helper/gopher, this makes life easier for everyone. The deep-well side is deep enough to hold short extensions, or adapters and knuckles (or wobble). However, if you have a fully loaded Holder, picking it up solely by the handle tends to cause a crack over time -- not in the handle, but actually at the end of where the magnet is mounted, where the holder tends to flex. This isn't a dealbreaker, but is a design flaw to be aware of. I prefer the bright orange over the red, purely for contrast/readability of my labels. Regardless, I use these in every toolbox I own. Well worth it.

Worked perfect, fit in my toolbox And sockets are not everywhere

The quality is unbeatable at this price. The magnet is very strong. Won't be losing your sockets using this. All my 1/4 sockets fit perfectly into the slots. Even had some left over for a 3 inch extension and some other drivers.

Great tool for organizing my toolbox keeping all my sockets in place

bought as a replacement for my old one that i ran over with my car. my only complaint is that it is not red to match my others

Magnet should have more strength.

Used this brand as a technician at work and at home

home

Replaced my other one I had for many years. Very strong well made

I would leave a five-star review because the quality of the material and the magnet are fantastic but the slot holes are kind of brand specific if you have heavy walled impact sockets they are not going to fit into these. My snap-on sockets fit in there but my Mac sockets will not. My Carlisle impact sockets fit perfectly but harbor freight brand or power built and Stanley are too thick to fit into these holders which I bought them to organize my miscellaneous sockets which did not work out so I ended up giving them to a co-worker

tray works good holds all the sockets but I find the magnet a little week. If your attaching it to a vertical surface it will slide down until it hits something that stops it. fortunately i store it in a tool box drawer

Magnets are plenty strong to keep sockets where they should be, even if mounted vertical instead of horizontal. My ownly recommendation is another slot or two since I am one short for my 1/2" set on the big end.

Excellent product, timely delivery

Great little socket tray I know because I have used them for many years .

Its able to hold very heavy impact sockets. A

I have 4 of these, they are the bomb. Easy to use, takes up less space than other options. I highly reccomend.

It works great.

Impact deep well sockets hold perfectly in this tray, but don't get stuck when intentionally removing them. Perfect !