Description:

3/4" Bore Brake Drum Sprocket Hub. 3/16" Keyway for Go Kart Cart Mini Bike Trike. 4" Outer Diameter, 3/4" Bore with 3/16" keyway & 2 Set Screws. (4) 1/4" Bolt Holes on a 3.228" Bolt Hole Circle, (4) 3/8" Bolt Holes on a 2 7/8" Bolt Hole Circle. Used for 4'' and 4.5'' brake drums or rear axle sprockets.