178PCS M6 Hex Socket Screw Assortment Kit, M6x8/10/12/16/20/25/30/35 mm | M6-1.0 Hex Socket Cap Head Bolts Nuts Washers Assorted Set, Metric 5mm Screws for 3D Print, Grade 12.9 Alloy Steel Black Zinc

178PCS M6 Hex Socket Screw Assortment Kit, M6x8/10/12/16/20/25/30/35 mm | M6-1.0 Hex Socket Cap Head Bolts Nuts Washers Assorted Set, Metric 5mm Screws for 3D Print, Grade 12.9 Alloy Steel Black Zinc

• 12.9 GRADE SUPERIOR STRENGTH：Engineering excellence for heavy-duty tasks. Unlike common 8.8 grade or stainless screws that snap under pressure, our 12.9 grade carbon steel bolts offer ultimate tensile strength. This effectively solves the pain point of "screw head shearing" in high-torque automotive or mechanical repairs.
• EXCLUSIVE M6 FULL-SIZE SELECTION：Stop searching for hard-to-find M6 sizes. We’ve curated 8 essential lengths from 8mm up to 35mm. This specialized M6 assortment fills the market gap, ensuring you have the exact bolt for engine mounts, furniture frames, or heavy machinery without buying multiple individual packs.
• PRO-GRADE BLACK ZINC FINISH：Durability meets aesthetics. Each fastener is treated with a premium black zinc plating, providing enhanced rust resistance and a sleek look that won't flake off. Ideal for black-themed PC builds, dark automotive interiors, or outdoor equipment where silver hardware would be too conspicuous.
• COMPLETE 4-IN-1 FASTENING SYSTEM：One box, total solution. This 178-piece kit includes not just bolts, but perfectly matched M6 nuts, flat washers, and spring washers, plus a dedicated Allen wrench. No more frustration over mismatched threads or missing components during your project.
• REINFORCED CASE & CLEAR IDENTIFICATION：Stay organized under pressure. Our high-transparency storage box features reinforced latches and dividers to prevent mixing. A detailed size chart is included inside the lid, allowing for instant identification of lengths from M68 to M635, even in a busy workspace.