Knitter-Swtich Micro Snap Action Swtiches. Product Description Knitter-Switch DM-SSM series of witches are micro miniature snap action switches. These switches have an impressive mechanical life of 300000 operations. The DM-SSM series also have silver plated contacts and terminal for improved connections. These switches are non-shorting and have a switch configuration of on-mom.. Features and Benefits 300000 operations. Non-shorting. Silver plated terminals and contacts. On-mom switch configuration.