These are adjustable curtain brackets,they can be extended the length that customers want,and it is very convenience to use. Material: iron Finishes: Anti-brass, Anti-copper, Chrome, Stainless steel, Black nickel, Brushed brass, Brushed nickel, Matte nickel, Matte gold, Imitation gold and so onDiameter:12mm,15mm,16mm,18mm,19mm,25mm,28mm any size we can provide