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Plastic backing plate with slot, tab and locking hook. Stackable and thanks to the ribbing, the plates do not slip. The locking hook prevents the plate from slipping off the screw, the tab serves for better fine adjustment. Quick and optimal solution for balancing and aligning in window and door construction, interior and dry construction, for metal, steel and facade construction, carpentry and roofing crafts, assembly, glass and painting crafts.