Fgruh 660PCS M4 Screws with Nuts Assortment Kit, M4-0.7 x 6/8/10/12/16/20/30 mm Hex Button Head Cap Bolts, & Washers Assorted Set - Grade 10.9 Alloy Steel Machine Screw, Black Zinc Plated

【Perfect for DIY Projects】 This M4 button head screws assortment kit are ideal for hobbyists working with 3D printing, electronics, RC models, DIY repairs, chair replacement and CNC machinery, offering precision for intricate designs. 【Standardized Metric Sizes】 -The M4-0.7 hex socket button head cap screw set come with 7 commonly used lengths—M4 x 6mm, 8mm, 10mm, 12mm, 16mm,20mm,30mm—ideal for routine installations and repairs. They meet standard metric specs, the average error is less than 0.01mm. 【Premium 10.9 Grade Alloy Steel】- This black M4 bolts, nuts and washers assorted kit are crafted from high-strength 10.9 grade alloy steel, ensuring exceptional durability and load-bearing capacity. High-strength steel resists wear, corrosion, and heavy loads, ideal for harsh environments. 【Oil-Free & Rust-Proof】 -Black zinc plating means no greasy mess—keep hands and projects clean. Superior rust resistance ensuring long life.This 4mm black allen head bolts kit perfect for any indoor/light outdoor use. 【Smart Storage Box 】- The metric small machine screws hardware kit comes in a durable, compartmentalized case with clear size labels—so you can spot the right screw instantly. Keeps your workspace tidy and speeds up project progress, making every job smoother.