Candipaige

I am wondering where people order their eyelets and grommets from. I am making an arm gaurd for a friend and want the inside of the eyelet to be smooth and not scratch her arm. I am just looking into all this hardware and find there are different sizes. Do you have to have the matching setter for eyelets too? I bought a 4mm hand tool setter which is not working for the eyelets I bought. Tandy leather only had a setter for 5 and 6 mm. Just getting a bit frustrated and need something good quality