Metric 388 Pcs Screw Assortment Kit M5 M6 M8 M10 - Organized Set

In this review of the 388 Pcs Metric Machine Screw Assortment Kit, the bottom line is simple: it is a practical, all-in-one solution for hobbyists, small workshop owners, and anyone who frequently performs small repairs. The kit's biggest selling point is its broad range of sizes and organized packaging, which makes finding the right M5, M6, M8 or M10 button head screw, nut or washer fast and predictable. For tasks like 3D printer maintenance, appliance fixes or precision instrument work, this set removes the usual scavenging for compatible fasteners.

Key Features

• 388-piece assortment: A large selection of button head bolts, nuts and flat washers gives plenty of spare parts for multiple projects without repeated purchases.
• Range of lengths: Bolts from 16mm to 100mm cover common repair and assembly needs so users rarely need an extra fastener.
• 304 stainless steel construction: Corrosion and moisture resistance make these fasteners suitable for long-term use and for environments where rust is a concern.
• Organized sturdy box: The kit is packed in a durable case designed to withstand weight and keep pieces separated to prevent scattering during use.
• Includes hex wrenches and washers: The added tools and flat washers make installation straightforward and reduce the need to look for matching hardware.

Who It's For

This kit is aimed at DIY enthusiasts, makers, and technicians who work with precision machinery, electronics, household appliances or communication equipment and need a broad set of metric fasteners on hand. It is also a convenient option for 3D printing hobbyists who frequently swap parts and require corrosion-resistant hardware.

Those who should look elsewhere include professionals needing industrial-grade, certified fasteners for safety-critical structural work, or users who require non-button head styles or metric sizes outside M5 to M10. If every fastener must meet a specific grade or tolerance certification, a specialist supplier is a better fit.

Pros & Cons

Pros

• Wide variety of sizes and lengths provides flexibility across many small repair tasks.
• Made from 304 stainless steel for good rust and corrosion resistance.
• Well organized in a sturdy box to keep pieces accessible and reduce loss.
• Includes matching nuts, flat washers and hex wrenches to complete many installations.

Cons

• Quality reports are mixed by customers, and some note that internal box separators can break under heavy use.
• Only button head bolts are included, so those needing other head styles must source them separately.

Specifications

Total pieces	388 pcs
Bolt sizes	M5, M6, M8, M10
Bolt lengths	16mm to 100mm
Material	304 stainless steel
Contents	Button head bolts, hex nuts, flat washers, hex wrenches
Packaging	Sturdy organizer box with separators

Our Verdict

This metric fastener kit is a solid value for hobbyists and small repair work because it bundles a wide range of sizes and includes matching nuts, washers and hex wrenches in a durable case. It offers good corrosion resistance from 304 stainless steel and saves time by keeping parts organized, though buyers wanting varied head types or certified industrial fasteners should consider specialized sources.

Frequently Asked Questions

Does the kit include washers and wrenches?
Yes, the set includes flat washers and a set of hex wrenches to assist with installation.

Are the screws corrosion resistant?
Yes, the bolts and nuts are made from 304 stainless steel, which provides rust and moisture resistance.

Will I find all common lengths in the box?
The kit covers lengths from 16mm to 100mm across M5 to M10 sizes, which addresses most small repair and assembly needs.