Usage Tips:Bead chain: each group is equipped with clutch, bracket, bead chain (total 3m long) and screws, it is a good helper for your curtain.Suitable for 25mm diameter tubes: The accessory kit is standard with roller shadow with 1 "(25mm) diameter tubes. Please check inside your drum blind ring before ordering.Easy to install, just a few minutes: first install holes in the ceiling or wall, then secure the bracket, can be installed on the top, side or front, can be left or right hand operation.Main material :POM + thickened stainless steel core; High hardness, high rigidity, high wear resistanceBlind Roll Spare parts Replacement Repair kit: This is the mounting bracket for all crank operations of external/indoor rolling blinds and can be used in offices, homes, hotels, and any other place where rolling blinds are needed.Product specification: 12*10*4cmcolor: WhiteProduct list: 1* Curtain control head