This coupler assembly consists of the fllowing:

1pc  0208470A  1/2" Coupler Half Only
1pc  0208470B  5/8" Coupler Half Only
1pc  0208470C  Center Spider

This couples a 1/2" diameter shaft to a 5/8" diameter shaft

If you need a 1/2" Coupler Half  to a 1/2"  Coupler Half   , you must order the following components:

2 pcs of a 0208470A  1/2" Coupler Half only
1 pc   of a 0208470C  Center Spider

If you need a 5/8" Coupler to 5/8" Bore coupler Assembly, you must order the following components:

2 pcs of a 0208470B  5/8" Coupler Half only
1 pc   of a 0208470C  Center Spider