1 inch diameter at extension connection point.
582593
The diameter of the socket extension is about an inch making deep well nuts nearly impossible to get. Had to switch to my crescent wrench when working on lawn mower engine as they were to large to get the carburetor off. Otherwise very happy with them.
55658
This one works awesome, I have used quite a few that do not.

It is a little over a foot in diameter.
266676
Did exactly as it said it would.  Extended the faucet by 1"
4564650
Looks like they are good quality and would work well.  Unfortunately, they were a bit too long for my application.  These extensions are more than the advertised length of one inch.  When installed it extended the light outside the can (lower than the ceiling) which looked bad.  I need this same product but only an actual one inch in length.
2291890
The male end connection is shorter and smaller in diameter than a standard audio plug in connection.  I desire a refund or an exchange for a male/female connections, 12 foot extension that fits the standard audio plug size.
1930472
This cable appears to have been constructed well, but the description does not give enough detail.  The 1ft is actually only 8" between the ends, each cable end is 2.25".

I bought this to replace my 1ft clearmax black extension cable, which was actually 12" of flexible cable between the ends. Stellar labs also measures the cable by the length between the ends.
839579
Good mounting hardware. Cable length needs to be about 1 foot longer to reach more areas in the dashboard for mounting
2334946
I bought 2 of these for 1/4" drive metric and SAE sockets. I removed the magnetic strip from the backs and used screws and nuts to put them back to back for my toolbag. They were slightly different lengths, so I had to cut 1/16" of one.
3189978
The product description clearly states:  *Shaft diameter: 12 mm (15/32")
When I received it, I measured and it was 6.7mm (1/4"). That's HALF the diameter.
Obviously, trying to use this 1/4" diameter switch to replace a 1/2" diameter
switch will not work unless kludged with washers.  Else switch will fall through
any 1/2" hole.

It blows me away that several folks who have reviewed this switch spotted this discrepancy yet they gave it 5-stars.  Are you kidding?

Examples of 5-star comments who spotted this problem:
From Justin G:  ...do note the size.. it's pretty tiny.
From James:  ... The button is much smaller than I thought.
From frogracing:  ...The button is really small as others have already commented
From Amazon Customer: ...The button is slightly smaller than I thought it would be

No kidding, fellas.

Here's the switch that I ended up purchasing which is indeed 1/2" and I really like the screw attachments rather than needing to solder.
<a data-hook="product-link-linked" class="a-link-normal" href="/Gardner-Bender-GSW-22-Normal-Off-Push-Button-Switch/dp/B000BW0YWG/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Gardner Bender GSW-22 Normal Off Push Button Switch</a>
4239270
I wish I had known how large the diameter of plugs was. I would not have bought them. 14 AWG wire connects very well but the plugs barely fit
my speaker terminals (I had to squeeze them with pliers to reduce diameter). They will not fit the receiver terminals at all. I have to buy others
to fit receiver terminals. Make sure they will fit before you buy!!!!!
1847195
Like most other people considering this product, I have a flatscreen TV that came too close to the wall to use the supplied cables. These did exactly what I needed them to. I even bought a few spares just because the price was too good (it looks like that is no longer the case)!

For those interested, from the male tip to the corner edge is 1.25 inches. However, in practice, the aluminum sheath would be recessed around the adjoining female end, so this adapter would only protrude from the back of your TV by a little less than 0.75 inch (11/16 inch, to be exact). From the female tip to the corner edge is 1 inch.
945979
Hate to give 1 star, but I'll take it away when description is fixed.
These have a diameter of closer to 0.4 inch, and as a result they do not fit in the light fixture i intended them for.
2468930
They are too small diameter to use on most garden hose connections.
1475408
Not quite 3/4" (so, shy of the stated .8"), and has to be about the smallest safety pin out there, which I've never been able to use (doesn't go thru the thinnest fabric and my fingers which are on the small side, have difficulty handling it).  If you want this size, check at a dollar store.
4454424
This does not allow a 1.5" diameter and is hard to screw into sand and clamshells.

I bought a two-foot dowel that fits snugly into the anchor and popped off the shaft end plug so it will go over the dowel.

And I drilled a hole in the dowel for a cord to help me screw the anchor into the ground
3606465
than 2-3 thinner wires. I found them to be too narrow for my needs. I probably been more inquisitive to realize its diameter would not suffice my needs. Otherwise its constructed well.
2577522
Be careful as these may work for your needs  but are so small in outside diameter.  They are much smaller to use as stops in repairing cable for a garage door with circular torsion springs than the original cables with stops.  In addition they are pretty soft aluminum offering not a lot of bearing area against the guide slot for 1/8 inch cable wrapped around the cable wheel.  I may have not focused on the OD when purchasing.  They are a good price and I found a use for some of them.