Hello Kreg, It's great to see some new products to start out our 2019. What size hole are these made for? Marc www.instagram.com/greatlakescustomwoodworks

Hey, Marc. These are 3/4" diameter. I see you have some Festool gear on your cool Instagram account. If you need dogs that are 20mm, we have those too, link below.https://www.toolnut.com/catalogsearch/result/?q=parf+dogs