Due to application, These arbors are not Furnished with hex nut or washers., #47611, diameter (D) 1/4-28 Nf, shank (D) 1/4, overall length (L) 1-13/16, L1 1-7/16, application screw Type Mortising cutters 55250 through 55258., B 1/4, 47611 Threaded arbor for screw Type Mortising cutters 1/4-28 Nf DIA x 1/4 height x 1/4 inch Shank