Bead chain: each group is equipped with coupling, bracket, bead chain (total 3m long) and screws, it is a good helper for your curtain. Suitable for 25mm diameter tube: The accessory kit is standard with roller blind with 1 \" (25mm) diameter tube. Please check the inside of your roller blind ring before ordering. Easy to install, just a few minutes: first install holes in the ceiling or wall, then attach the bracket, can be installed on the top, side or front, can be mounted left or right hand. Main material: POM + thickened stainless steel core; High hardness, high rigidity, high wear resistance Roller Blind Spare Parts Repair Kit: This is the mounting bracket for all crank operations of external/internal roller blinds and can be used in offices, homes, hotels and other places where roller blinds are needed. Product specification: 12*10*4cm Color: White Product list: 1* Curtain control head