Herm Sprenger stainless steel ClicLock buckles have a guaranteed tensile strength of 200kg.
 
The plastic push button is made from high quality plastic components that are both UV and salt water proof.
 
The ClicLock features a plastic jacket that can be slid into place preventing the button from being depressed for additional security.
 
The holes in the ClicLock are specific to the gauge of a 3.0mm/3.2mm collar, or a 4.0mm collar.