Miller® Smith® MC-12 Series Size 1 One-Piece Acetylene Cutting Tip cuts 1/2 - 5/8" thick metal and is perfect for general medium duty hand cutting. Cutting tip requires 75 - 81 SCFH cutting oxygen flow rate, 9 SCFH preheat oxygen flow rate and 7 SCFH preheat acetylene flow rate for cutting metals. Cutting tip is compatible with Smith MC509, CC509P, DG109A and AC309 torches.