1 1/4 Inch Arbor Extension for Delta and Rockwell 12/14 Inch Table Saws. You will receive the 34-947 1 Inch Arbor Extension and a 1 1/4 to 1 inch bushing to allow you to use the 1 inch Arbor with your larger blades. Arbor Nut 902-01-201-2553 and Flange 422-06-103-5003 available separately.