This is the most popular series of insulated binding posts manufactured by Johnson. For standard banana plug: .175" (4.44mm) across flats.

 

Order#	Color	1-9	10-99	100+
111-0101-001	White	$3.49	$2.99	$2.49
111-0102-001	Red	$3.49	$2.99	$2.49
111-0103-001	Black	$3.49	$2.99	$2.49
111-0104-001	Green	$3.49	$2.99	$2.49
111-0106-001	Orange	$3.49	$2.99	$2.49
111-0107-001	Yellow	$3.49	$2.99	$2.49
111-0108-001	Brown	$3.49	$2.99	$2.49
111-0110-001	Blue	$3.49	$2.99	$2.49
111-0112-001	Violet	$3.49	$2.99	$2.49
111-0113-001	Gray	$3.49	$2.99	$2.49