The sizing will have to be determined by measuring your fingers. Most pro-shops have a tool that will help to get your insert sizes so you may check you local pro-shop for sizing tips and answers.

Hi inserts, these inserts are sold individually.

Hello Bernie! These particular inserts are finger inserts.

This is a very good question. They do not all have the same outer diameter. There is a great link on Vise's website with a chart to show you the outer diameter for each size. ( a large majority will be 31/32 outer diameter but not all ) Here is a link to this chart: https://www.viseinserts.com/fingerinserts_1.html

You will, more than likely, need to speak to your driller about that.

They will be pretty yellow but not a neon yellow.

There is only one piece per box.