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