10" hub-drum has 5-bolt pattern on 4-1/2" circle. 2½" deep inside for use with 10" x 2¼" electric or hydraulic brakes (not included). Includes pressed in bearing races. Please note the following is NOT included. Inner bearing (L-68149), Outer bearing (L-44649), Grease seal (SL-172), Lug nuts (STN-506) or Dust cap (DC-1505).