[USED FOR] - Aluminum profile 4040 series with slot 8mm.[SIZE] - 7.09" (180mm) long, 0.79" (20mm) wide, 0.39" (10mm) thick.[MATERIAL] - Constructed from carbon steel, zinc plated finish, good rust resistance and durable to use.[EASY TO USE] - When it is installed, it is inserted into the pit of the joint of two profiles, and then tightened with set screws.[WIDELY USED] - To build CNC routers, 3D printers, CNC laser cutters, CNC plasma cutters, robotics projects, 3D carvers, machine guards, workstations, etc.