M8 4040 T-Slot Nut (pack 10) is a pack of 10 T-slot nuts that are designed to fit into the grooves of 40x40 aluminium profiles. They have an M8 thread and can be used to connect various components such as brackets, hinges, handles, sensors, etc. to the profiles. The T-slot nuts are made of carbon steel and have a nickel-plated surface for corrosion resistance and durability. They can be easily inserted into the grooves by sliding them along the profile or by dropping them into the slot at any point. The T-slot nuts have a spring-loaded ball that prevents them from rotating when tightened. The T-slot nuts are suitable for DIY projects, industrial applications, furniture making, robotics, etc.