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 have high hardness and long service life. Nickel plated ensures good rust resistance. Easy to use: T nuts are easy to use and convenient for connecting aluminum profiles to other parts. These T-slot nuts must be inserted into the groove before profile assembly; subsequent swiveling or changing is not possible. Industrial use: the sliding nuts are referred to as T-nuts and square nuts, commonly used in automated production lines and assembly workbenches. Widely used: M8 sliding T-nut set often used for architecture, woodworking, industrial aluminum frame structures, 3D printers, CNC laser cutters, robotics projects, and more.