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High-Quality Materials:Made of premium nickel-plated carbon steel, these roll-in spring M8 T-nuts are rust-proof, wear-resistant and high hardness. Not easy to deform or break, ensures long service life for aluminum profile assembly and industrial use. Product Specifications: These are M8 thread roll-in spring T-nuts, half round design with built-in spring ball, perfectly fit 8mm T-slot European Standard 4040 series aluminum profiles, 50 pieces per pack to meet your various connection needs. Practical Spring Ball Design: The built-in spring ball allows you to roll the nut into the T-slot from any position without sliding from the end, and prevents the nut from spinning while tightening screws, making installation more efficient and connection more stable. User-Friendly Installation: No complicated tools required, just push and roll the nut into the slot, saving your assembly time and effort, even beginners can use it easily, effectively reducing the risk of installation-related returns. Wide Application: These T-nuts are ideal for 3D printers, CNC routers, workbenches, DIY frames and automation equipment using 4040 series aluminum profiles, meeting your different project requirements.