Features: Roller blind fittings kit: The 17mm roller shutter head controller can accurately control the up and down movement of the roller shutter, providing a convenient operating experience. Fits: Mounting kits for standard blinds with diameter of 17mm. Quality: These roller curtain fittings replacement kits are made of quality material, lightweight but durable enough to hold most standard roller blinds. Easy to install: easy and flexible to install, precise control system that can adjust the opening and closing speed and position of the roller shutter. Widely application: can be used in home, hotel, shopping mall, and any other places where there is shade curtain. Specifications: Material: Plastic Type: 1 Set, 2 Sets(optional) Bead Chain: Approx. 1.8m/70.86inch/5.9ft (more detail size please refer to pictures) Quantity: 8Pcs/set Package Includes: 1x or 2x 17mm Roller Shutter Head Controller Accessories Set(optional) note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.