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Collar complete with screw and dowel with increased band size for high loads. The side flaps of the left plus dowel hold the screw in the ceiling application, simplifying installation. Operation: Drill, insert the dowel and expand it with the double threaded screw. Screw on the collar. Supporting materials: concrete; solid brick brick; semi-solid brick (perforated vertically). Laterocement floors. Technical details: Thread: M12. Hole diameter: 12 mm. Width x thickness of the collar: 30 x 3 mm. Fixing length: 60 mm Thread: M12 x 171 [mm]