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Easy to be roll into T slot of aluminum profile. Nickel-plated surface, resistant to rust. 4040 series aluminum profile T-nuts are widely used in the construction of CNC milling machines, 3D printers, CNC laser cutting machines, CNC plasma cutting machines, robot projects, 3D engraving machines, machine protective covers, workstations, etc. Attention:It is not suitable for 1mm and 2mm thick 4040 series aluminum profiles. Customer service: We guarantee the quality of our products. If you have any question when using, please feel free to contact us by Amazon message.