What is the difference between the JOSEF KIHLBERG JK560-15K and the JOSEF KIHLBERG JK561-15KThe JK560-15K has a 1-3/8" crown size, while the JK561-15K has a 1-1/4" crown size. These would be used in different staplers. If you can identify the model of the tool you are using, we can confirm which staple type you could use.