ABS housing, designed for roller shutter belts with a width of 14 mm.Surface screwed belt winder: Operation is simple and convenient, it attaches to the entrance flap strap and the flap can be pulled without much effort. Strap guide with brushReduce the friction between the strap and the aluminum alloy guide rail, prevent the strap from lint, clean the dust, prevent pests, and the strap has a longer service life.with 5m belt, 5m mini belt (14mm) in gray color is already wound and pre-tensioned, with hinge system.Size: roller shutter belt winder :172.5*125*23mm strap 14mm*5m.Included1*belt winder with 5m of belta belt winder for the straps of roller shutters with a belt width of 14 mm. The tape winder is suitable for surface mounting and convinces with its long service life. After being screwed on, the strip roller can be rotated 180. Simply fix the roller shutter to be screwed on the window frame or on the wall (surface mounting). Assembly instructions: Fully close the roller shutter .Remove the old case from the belt winder and remove the old strap.Mount the new belt winder on the wall or window frame.Pull the strap from the belt winderOpen the belt winder and attach the roller shutter band to the spring drum. Carefully loosen the spring drum lock and let the roller shutter band wind up slowly. Close the band winder. Dimensions: 23mmx 172.5mmx 125mm /p