tool is included in the package to adjust the connector angle from 90 degrees to 180 degrees. The in the middle is for fixing the corner connector angle, and the 2 screws and plastic rings on both sides are for fixing the curtain rod. Package includes 2 pieces of corner curtain rod connector and tools, Curtain rod corner connector perfect for corner curtain rod up to 3/4 inch (1.9cm) in diameter. Heavy Duty Hinged Elbow Connector for 3/4inch bay window curtain rod. Curtain rod corner connector is made of high quality stainless steel, which is high hardness, strong and , can attach heavy curtain rods, and the is beautifully painted. Curtain rod brackets are finished with attractive paint and are perfect for your living room, kitchen, bedroom, dining room, and more., Weight: 0.94357848136 Pounds, Manufacturer: Tuidzljd