KMC K810 Missing Link
Because of their mushroomed pins, using a master link on K810 SL chains is highly recommended over pushing the pins out and back in (which can damage both the pins and side plates, creating a weak spot).
If that's your chain of choice, pick up a few spares. Missing Links are good to have around.
• for use with KMC 3/32" K810SL chains only
• installs easily without tools