Features: Upgrade your roller shutter systems with this durability belt reel box, featuring wear resistant belt and Korean imported heavy type spring that withstands 10,000+ cycles. The housing with 153mm pre drilled holes enables wall mounting, while included guide belt prevents dust induced wear for smooth operations. Ideal for homeowners seeking to replace worn out belt reels in residential or commercial roller shutter maintenance projects. Perfectly integrates into European styles window treatments for patios, garages, or storefronts requiring reliability shades control mechanisms. Engineered with space saving dimensions and scratch resistant polymer construction, this reel box maintains consistent tension across various climate conditions. Specifications: Dimension:125x172.5x23mm/4.92×6.79×0.91in Component:plastic Package Includes: 1set hand-pulled belt box note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.