Miller® Smith® SC-12 Series Size 4 One-Piece Acetylene Cutting Tip cuts 2 1/2 - 4" thick metal and is perfect for general hand and machine cutting. Cutting tip requires 240 - 315 SCFH cutting oxygen flow rate, 15 - 16 SCFH preheat oxygen flow rate and 13 - 14 SCFH preheat acetylene flow rate for cutting metals. Heavy duty tip offers excellent preheat characteristics needed for machine cutting. It is compatible with Smith SC200/DG200 series attachments as well as SC/DG series hand torches and machine torches.