These professional looking rivets are perfect for purses, backpacks, and handbags! These rivets are durable and look great from both sides. They are even strong enough to hold leather, cork fabric, and vinyl. All of the components to create 24 rivets are included. It is important to learn how to choose the correct size, how to properly install rivets, and about the tools needed for proper installation. They are very easy to attach. Tools are not included. Medium 24ct set: Cap 5/16in (8mm), Post 5/16in (8mm), Base 5/16in (8mm).