No plug here will tell you whether it can come back out
Fourteen publish a base width, fifteen publish a widest point, none publishes both. The ratio between those two is what stops it disappearing.
Thirty-one plugs from five manufacturers sit in this library, from £18.99 to £97.49. Not one of them publishes both numbers that decide whether it can come back out.
Buy the one whose base you can measure against its widest point. Since no page gives you both, that means measuring it yourself before the first use, and treating the base as the only line on the spec sheet that matters.
The base is doing arithmetic, not decoration
A plug is held in by geometry. The sphincter closes behind the widest part of the body, and what stops the thing travelling further is a base that cannot pass through the same opening. Get that wrong and nothing else rescues it: not the material, not the motor, not the price.
So there is one calculation worth doing, and it is base width divided by widest insertable width. The first number has to be clearly larger than the second. A 35mm body behind a 60mm base is doing what it was designed to do. A 35mm body behind a 38mm base is depending on you.
One brand describes the inside, four describe the outside
Fourteen of the thirty-one publish an overall width. On a 105mm plug an 82mm width is the base rather than the body, so those fourteen tell you the outside of the object and nothing about the part that goes in. They come from Rocks-Off, Svakom, Maude and NU Sensuelle.
Fifteen publish a widest point, and all fifteen are Nexus, which prints an insertable length and a maximum diameter for most of its range.
The two sets do not overlap. Not one product here publishes both, so the division above cannot be performed for any plug in this library at any price.
Which base shapes have margin
Base shape matters more than base size, and the two get conflated. A disc base has to be wide enough in every direction that its diameter exceeds the body's. A T-bar anchor does the same job with less material, because it is long in one axis and thin in the other and sits between the cheeks rather than against them. That is why a T-bar can look flimsy and still be the safer of the two.
The shape with the least margin is a round jewel base only slightly wider than the body, and it is also the shape sold hardest at entry prices. The jewel is decoration. The disc behind it is the mechanism, and the disc is usually smaller than the jewel makes it look.
What to measure before the first use
Put it on a table and measure the dimension that would have to pass through the opening. For a disc that is its diameter. For a T-bar it is its length, because the length is what will not fit.
Then measure the widest part of the body. If the base is not at least half again that width, treat it as a plug for short use with a hand on it rather than something to wear.
If it does not come back out
Go to an emergency department. Do not spend an hour trying first, and do not go looking for something to hook it with, because that is how a short visit becomes a long one. A retained plug is a routine presentation and the staff have seen it before.
Who should not buy one
Anyone buying from a page that will not let you compare the base with the body, which is every plug in this library. If you are going to buy anyway, buy from a maker that publishes an insertable length and a maximum diameter, measure the base yourself when it arrives, and send it back if the margin is not there.
The cheapest plug here is £18.99 and the dearest is £97.49. Price does not appear in the calculation above, and nothing in this library suggests it should.
Where these numbers come from
The widths, widest points and insertable lengths are read from each brand's own product page between 27 October and 3 November 2026: the specification tables across Nexus's range, the size blocks on Rocks-Off's, and the dimension fields on Svakom's, Maude's and NU Sensuelle's. Every figure is listed on the product page in the library, next to the review count where one exists. Prices are each brand's own, converted to pounds at the rate shown on the product page, and they move. Check the page before you buy.
Questions that come up
Is a bigger base always safer?
Up to a point. A base too wide is uncomfortable to sit on and gets worn less, and a plug that gets worn less is not safer in any useful sense. The test is whether it clears the body comfortably, not whether it is the largest on the page.
Does material change the risk?
It changes the consequence. Silicone has some give, which matters if it has to be removed in a clinic. Glass and steel do not, and a chipped or cracked rigid plug is a different problem again.
Why do the review scores not settle this?
Only seven of the thirty-one carry a rating at all, and three carry a star split, so there is nothing to compare across the category. Fit problems also show up as one and two stars for a dozen reasons that have nothing to do with retention.
Can I use the length to judge the base?
No. Bendz Small is 41mm insertable with a 55mm widest point. Tornado Probe Edition Large is 188mm insertable with 45mm. Length and width move independently across this range.
Are the cheap ones worse on this?
Not on this measurement. The £18.99 plug publishes a base width. Several at four times the price publish only the inside dimension, which is the other half of the same sum.
More guides
The two dearest cock rings won't say what size they fit
Five of the eleven publish an inner diameter, 28mm to 42mm. Svakom prints two different figures for the same ring on the same page.
Prostate toys are mostly four inches, not six
Thirty-four of the fifty-five publish an insertable length. The median is 100mm, and one goes past five inches.
How to actually clean one
Most cleaning advice for these products is either too vague to act on or quietly wrong about the materials. The part that matters is knowing which of two categories yours falls into, because the two need different things and one of them cannot be sterilised at all.