Mortice Plate = 1 3/4" x 1" = (12 mm Round). Cast Face Fix = 80 x 30 (12 x 12 mm Square Hole). Cast Face Fix = 80 x 30 (12 x 20 mm Square Hole) For use on angles ie Ballustrade Stairs. Round 12 mm Face Fix = 50 x 20 (12 mm Round).
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