Fish Fin Punch - These punches were developed after having several testimonies from customers with sore wrists and thumbs from using small ID punchers. The Fish Fin Punch relieves stress on wrist during ID marking as it requires a very gentle pressure to cut a hole. Stainless steel puncher has a sloped edge which provides a cut rather than a punch, which minimizes animal discomfort. Autoclavable, but should be lubricated afterwards for long and trouble free usage.