Amana Tool - 47600 Router Arbor with Hex Nuts & Washers 5/16-24 Nf Dia x 7/8 Height x 1

Diameter (D) 5/16-24 no, Shank (D) 1/4, Overall length (L) 2-3/8, L1 1-1/4, Application 2 & 3-Wing Slotting assemblies, and single 4-Wing trim cutter assemblies.