When a missing or undersized spring stalls a repair, finding the right compression spring can turn a five-minute fix into a full afternoon. For anyone working with fasteners, springs, and industrial hardware, the useful question isn't just whether to buy a multi-pack; it's whether the sizes inside match the jobs you actually need to finish.
Quick verdict
The 390 Piece Compression Spring Assortment Kit makes a solid first-line parts kit for small repairs, hobby builds, and general maintenance. At USD 10.90, you get 390 springs in 28 combinations of diameter and length, stored in a reusable case with labeled sections. The set is built around 304 stainless steel for rust resistance, and the size range covers many compact spring applications. If you need large or heavy-duty springs, this assortment won't stretch that far.
Who it suits
This kit suits DIYers, repair techs, and anyone maintaining appliances, toys, or light industrial assembly. The wire diameters run from 0.3mm to 0.8mm, outer diameters from 2mm to 8mm, and free lengths from 5mm to 30mm. That spread covers typical roles like latch springs, small push buttons, carburetor return springs, and pen mechanisms. If you lack a dedicated spring stash, the labeled case makes it easy to find the right size without dumping parts across a bench.
What stands out
The multi-size selection is the main draw. Instead of ordering springs one by one, you have a range of common dimensions ready in one case. The 304 stainless steel material helps resist rust and corrosion in humid or stressed environments, so the set works as a go-to for outdoor gear or engine bays. The compartments keep each size separate, saving time when you're mid-task.
Meaningful trade-offs
The trade-off is in scale. All dimensions are on the smaller side: the largest outer diameter is 8mm and the longest free length is 30mm. If your repair calls for a heavy compression spring for suspension or a large-diameter industrial unit, this kit won't have it. Also, slight magnetism can occur due to the manufacturing process; that's a characteristic of stainless steel springs in this class and shouldn't affect typical compression duties, but it's worth knowing if your projects are sensitive to magnetism.
390 Piece Compression Spring Assortment Kit 28 Sizes Small Steel Springs Set
The value here is in having a ready set of compression springs in one case, rather than sourcing each size individually. If your work is small-scale repairs and builds, this kit covers a practical range of spring sizes. The limitation is the same compact scale: the assortment is built for small-diameter, short-length springs, so heavy-duty or large-format springs are outside its scope.
Bottom line
Buy this kit if you want a ready-to-use assortment for small springs across multiple projects. Skip it only if your work regularly uses springs larger than 30mm in free length or over 8mm in outer diameter. At USD 10.90, it gives you a practical alternative to hunting for individual parts.
