Spent the last 5 weeks working at an all purpose shop, both wood and metal. Shop manager would come in every morning, scribbled some bird scratch, stick figures with crude approximate numbers on wood, paper, plastic, metal, old lunch wrappers... than it was my job to make up this mad scientist idea and turn it into something... actually was kinda a fun job lol
Shop manager had a crude deburring tool, loved to use it on everything. I got in the habit of using it also.
So I went on amazon and purchased a set of nova deburring tools, 1 for sheetmetal, 1 for holes and 1 for standard deburring