Premium Material: The connector is made of high quality carbon steel, which is durable and resistant to wear and corrosion. Easy to install: Used to straighten between two profiles , install it in the groove of the two profiles, then tighten the screws.Comes with screws, easy to install. Various types: 4 different types of connectors: 2020, 3030,4040,4545 with different mounting holes (M5/M6/M8), will satisfy your needs. Wide range of applications: Commonly used for connection of aluminum profiles, both industrial and household use. Quick connection: These connectors can quickly connect and disconnect two profiles, easy to use.