You are buying 4 Challenge Letterpress 2-3/4"Quoins.  There actually is several groups of 4 quoins, but you are buying 1 group of 4 quoins.  Each quoin is 2 wedges.  These are in real good used condition, even though they have been around many years.  I no longer have a Quoin Key.  Contact Ken for additional information at Five seven three - 864 - Two five four seven.