Miller® Smith® MC-12 Series Size 2 One-Piece Acetylene Cutting Tip cuts 3/4 - 1" thick metal and is perfect for general medium duty hand cutting. Cutting tip requires 107 - 108 SCFH cutting oxygen flow rate, 11 SCFH preheat oxygen flow rate and 9 SCFH preheat acetylene flow rate for cutting metals. Cutting tip is compatible with Smith MC509, CC509P, DG109A and AC309 torches.