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 to install in minutes: Simply drill holes in the ceiling or wall, attach the bracket, and secure in place. Can be mounted on the top, side, or front, with 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 external and indoor roller blinds, suitable for use in homes, offices, hotels, and other applications. Product dimensions: 12 x 10 x 4 cm Color: White Package includes: 1 x Curtain control head