Bead chain: each group includes clutch, bracket, bead chain (total 3m long), and screws, designed to assist with curtain operation. Suitable for 25mm diameter tubes: The accessory kit is compatible with roller blinds using 1" (25mm) diameter tubes. Please verify the tube size inside your roller blind before ordering. Easy to install in just a few minutes: Mount holes on ceiling or wall, then secure the bracket. Can be installed on top, side, or front, with left or right-hand operation. Main material: POM + thickened stainless steel core; offers high hardness, rigidity, and wear resistance. Blind roll spare parts replacement repair kit: Mounting bracket compatible with crank-operated external and indoor rolling blinds, suitable for use in offices, homes, hotels, and other locations. Product dimensions: 12 x 10 x 4 cm Color: White Package includes: 1 x Curtain control head