Slot blocks specification: package contains 20 pieces 30 series M8 T-nut for profiles with 8 mm slot. Profile compatibility: Type B. Size: L x W x H = 16 x 16 x 6 mm. Thread: M8. High quality: slot nuts made of high-quality carbon steel offer high hardness and long service life. Nickel plating ensures good rust resistance. Easy to use: T-nuts are easy to install and provide a convenient way to connect aluminum profiles to other components. Insert these T-slot nuts into the groove before profile assembly; subsequent swiveling or repositioning is not possible. Industrial use: these sliding nuts, also known as T-nuts or square nuts, are used in automated production lines and assembly workbenches. Widely used: M8 sliding T-nut groove set commonly used for architecture, woodworking, industrial aluminum frame structures, 3D printers, CNC laser cutters, robotics projects, and more.