Miller® Smith® MC-12 Series Size 3 One-Piece Acetylene Cutting Tip cuts 1 1/2 - 2" thick metal and is perfect for general medium duty hand cutting. Cutting tip requires 170 - 181 SCFH cutting oxygen flow rate, 12 SCFH preheat oxygen flow rate and 10 SCFH preheat acetylene flow rate for cutting metals. Cutting tip is compatible with Smith MC509, CC509P, DG109A and AC309 torches.