This is the first time I have bought these tools and used them to cut corks myself. I used these pliers to cut teak and royal starboard corks for my project. The bits worked very well on both wood and plastic. They've already paid for themselves as I was looking to buy $10 teak plugs that I made myself. King Starboard does not offer end caps and making them myself takes my project to the next level with a clean final look.