If you follow my social media pages you know that i am fanatical about which tools and supplies work best in my shop. I don't care about brand names, only which product works best without breaking the bank (too much). The following are the items i have tested and endorse, full disclosure these are Amazon Affiliate links, which has NO BEARING on my recomendations! Buying through my links does however help me afford the time and oppertunities to test further products and make accurate recomendations.
Here are products i use to tumble and debur my brass and copper items. One of the media options is for rounding and smothing, the other is to polish the brass should you desire.
Here are the drill bits i use to drill out the finger stalls and more. First one is great at cutting soft alloys such as brass and copper, remember to use low RPMs and oil, go slow. Next ones are used for beveling the finger stalls as well as other useful bits to have on hand.