Features : 1)Right Cap for 18mm Roller Blind 2)material: plastic 3)size: for 18mm tube 4)the bead chain :4.5*6mm Features: 1) little noise and easy to pull 2) Available for 18mm roller blind 3) Description: Large mechanism,right use4) material: plastic 5)size:for 18 mm tube 6) bead chain: 4.5*6mm