3/4 inch Spindle for newer Delta Shapers with longer taper. 3 1/4 under the Nut. For low profile cutters, Spacers may be needed to allow the Spindle Nut to tighten properly. Order: 904-10-031-4506 3/4 x 1/2 Spacer 904-10-031-4507 3/4 x 3/4 Spacer 904-10-031-4508 3/4 x 1 Spacer