A plain reading of the stated 3 mm blade thickness on the Small, Straight Bone-cutting One-piece Keel Boning Knife listing: what the figure describes, how it sits among the other stated dimensions, and what the listing leaves unstated.
What the 3 mm line describes
The Small, Straight Bone-cutting One-piece Keel Boning Knife listing gives blade thickness as 3 mm. Read that as a single stated dimension for the blade, not as a measurement you have checked. Blade thickness is the short dimension through the blade, taken from one flat face to the other. It is a different dimension from blade length, which runs along the blade, and from blade width, which is the height across the blade.
The listing keeps those three apart. It states a blade length of 18.2 cm, a blade width of 3.7 cm and a blade thickness of 3 mm on separate lines, alongside a total length of 31.3 cm. Because thickness is given in millimetres while the length and width are in centimetres, the unit is the first thing to notice. A number without its unit is not a measurement, so read the unit attached to each line rather than carrying one over from another.
Ordinary conversion is safe where the listing is consistent: 3 mm equals 0.3 cm. That changes how the figure is written, not what it measures.
What the figure does not pin down
The listing states 3 mm but does not say where along the blade the measurement is taken. It does not say whether the figure is a maximum at the spine, a reading at the thickest point, or a single point somewhere else. A blade that tapers toward the tip will not hold one thickness along its full length, so a single figure cannot describe every point on the blade.
The listing also does not explain how the thickness relates to the blade width of 3.7 cm. Width and thickness are presented as distinct dimensions, and the listing does not say which surfaces the width line measures. Neither figure fills in the missing measurement points for the other.
If the exact thickness at a particular point matters to your decision, ask the seller a question that produces a specific answer: at which point along the blade is the 3 mm taken, and is it a maximum or a single reading? A reply that names the location and the surfaces resolves the point; a reply that only restates 3 mm does not.
Reading it alongside the rest of the listing
The thickness line sits among other stated facts: a cutting material of 5CR, a stem material of red sandalwood, a net weight of 192 g, and a package line reading one product as shown in the selected option and product images. None of those facts changes what the thickness figure means, and the thickness figure does not add detail to them.
The description also notes that the product details are translated from the source listing. That is a provenance note about the text, not a claim about the knife. Figures and short material names tend to survive translation fairly intact, while descriptive wording depends on the translator, so the 3 mm line is a weaker reason for doubt than any prose on the page. It is still the listing's stated figure rather than a verified measurement.
The listing does not describe how the knife should be cared for or sharpened, and it does not say whether the blade or any other part of the knife is user-replaceable or serviceable. Those are separate questions for the seller, and none of them can be settled by reading the thickness line more closely.
Is 3 mm the same as 0.3 cm?
Yes. 3 mm equals 0.3 cm. The conversion changes how the figure is written, not what it measures, and the listing does not state where along the blade the thickness is taken.
Does the listing say whether 3 mm is a maximum thickness?
No. It states a blade thickness of 3 mm without naming the point along the blade or saying whether the figure is a maximum. Ask the seller if that detail matters to you.
Does the blade thickness figure tell me how the knife will feel or perform?
No. The line states one dimension only. The listing does not connect it to balance, handling, cutting performance or edge behaviour, and those are separate questions.
