Place 28" tile on spring-loaded base against the base and push scoring wheel back against the guide. Apply pressure when you're pushing the handle forward. The 22X titanium coated scoring wheel has just scored the tile. Pull handle back to guide and apply T-foot to tile and push down. You just cut your 28" porcelain tile. 28" Ishii Tile Cutter rip cuts 27 3/4" x 27 3/4" tile and diagonal cuts 20" x 20" tile with cutting thickness of 3/4".