In carbon steel blades, hard edge/ hard back for metal, better but more dollars bi-metal blades. These also come in variable pitch. wood is forgiving vs tooth count, metal not so. # teeth /in depends on thickness of material ( by the way on bandsaw blades you count the # of gullets in an inch for the tooth count) More teeth slower it cuts. like hack saw blades min. 2 teeth in material. in tubing only the wall thickness counts for blade selection. Example thinwall electric conduit 14 tpi or more, Plumbing pipe 10 tpi will work.