Blades for 72 Finish Mowers (5812703) - Set of 3. USED ON 6 FT CUT FINISH MOWERS. 72 Sicma finish mower model 1800. Length: 24 5/16" / 618 mm Width: 2 3/8" / 60 mm Thickness: 1/4" / 6 mm Center Hole Diameter: 3/4" / 19 mm Outer Hole Diameter: 7/16" / 10.5 mm Hole Spacing: 1 13/16" / 46 mm. Listing and template services provided by inkFrog.