Over the past 40 years Swingline has introduced and discontinued a number of stapler. Most were replaced by newer technology which they are known for. However, because of their change of market focus, some application areas were left uncovered.
One of these areas is saddle stapling. The two discontinued models were the gray 15E4 and the Black15E4-B. One of the options available is the Rapid 106E a commercial grade saddle stapler that uses the Rapid 66/6-8 staples.