One pair, or fifteen — and the difference is a mechanism · review
A 40 kg spinlock pair sold on floor protection as much as on load: cement-filled plastic plates, cross-knurled handles and four star collars. The plates are the reason it is cheap and the reason a bar fills up early.
The bottom line Bought on its plate list rather than on its headline. The 2 kg smallest plate is workable and the cement construction does what cement does — it is quiet, it is kind to a floor, and it takes up room on a bar that has no published length. Where the collection is never going to grow, that trade is fine; where it is, the missing bore figure is the reason to look further along the shelf.
The set is described as two spinlock bars with twelve plates — four of 5 kg, four of 2.5 kg and four of 2 kg — and four star collars. The plates are a plastic shell with a cement filling, and the maker sells that construction on two counts: it protects a floor from scratches, and it is quieter than metal.
The handles are described as cross-knurled to stop the hand sliding. The maker states a maximum of 20 kg per dumbbell.
Three figures that this shelf normally carries are absent from the listing: the bore in millimetres, the handle diameter, and the bar length.
The first of those is the one that matters most. A spinlock bar in this price band is usually cut for a 30 mm plate, but the listing does not say so, and a photograph of a threaded end is not a measurement. Anyone intending to add plates later has no published figure to buy against.
Cement in a shell is roughly a third of the density of cast iron, so the same mass takes about three times the thickness. On a bar with no published loadable length, that is a limit nobody can calculate in advance.
It is also the reason the set is priced where it is, and for a pair that never needs to exceed its supplied plates, the trade is a fair one.
Four screw collars with a star-shaped knob. They are slower than a spring clip and considerably more secure, which is the usual arrangement on a threaded bar, and the maker supplies four rather than two — enough for both bars without a second purchase.
About 30 € on the German Amazon store, on the one reading this page rests on.
The American, British, French, Italian and Spanish Amazon stores returned nothing at all, so the buy button there opens a search rather than an empty page.
These figures are what Keepa returned on the day this page was last written. Stock and prices move without notice.
Prices quoted in this text were read on 20 September 2026. The live price is at the top of the page.
| Weight range | Up to 20 kg per dumbbell, 40 kg for the pair, as the maker states it |
|---|---|
| Step size | 2 kg — the smallest plate supplied |
| Locking mechanism | Star screw collars, four supplied |
| Bore | Not published by the maker |
| Handle diameter | Not published by the maker |
| Knurl | Cross-knurled grip, described rather than measured |
| Overall length | Not published by the maker |
| Set contents | 2 bars, 12 plates (4 × 5 kg, 4 × 2.5 kg, 4 × 2 kg), 4 star collars |
| Amazon reference | B093VXD52B (one reference across 1 Amazon marketplace) |
| EAN | 4025327381058 |
The maker states up to 20 kg per dumbbell, which is the bar plus every plate on one side. The 40 kg that appears in the title is the pair together, and the two figures are the same set counted two ways.
Twelve, published as four of 5 kg, four of 2.5 kg and four of 2 kg. That gives 2 kg as the smallest change available and it is the figure that decides how usable the range is.
No. The listing describes star collars and knurled handles but gives no bore in millimetres, so whether additional plates would fit cannot be confirmed from it. The page records that rather than assuming the common figure.
A first pair where the floor matters and the total never needs to be high
Details checked on September 20, 2026.
Specifications: manufacturer sheet and Amazon product page. Prices and availability: Keepa. No product on this site has been physically tested.
400 mm connector, 15 mm foam padding
A two-in-one set sold across a 15 to 40 kg range, with a published 400 mm connecting tube and a stated 15 mm of foam padding on it. The contents list is complete; the plate breakdown is not.
Best for: Somebody buying the two-in-one arrangement rather than a specific plate list
44 cm bars, 40 cm connector, 50 kg per bar
A 20 kg pair that converts to a barbell with a supplied 40 cm connecting tube. Bar length, connector length and a per-bar load figure are all published, which is three more figures than most of this shelf gives.
Best for: A first purchase where one set has to be both dumbbells and a short barbell
16 plates in four steps, 47 cm bars
A 30 kg spinlock pair whose useful figure is its plate list: sixteen plates in four denominations, on two published 47 cm bars. The 1.25 kg smallest step is finer than most sets at this price.
Best for: Someone who wants small increments rather than a high ceiling
