Drill America 1" NPT 3" OD High Speed Steel Adjustable Pipe Die - DWT Series for Plumbing, Pipe Threading & Industrial Applications" (Note: I kept the technical specifications as they're important for both SEO and buyer searches, removed redundant "round" since OD implies round shape, and added application scenarios at the end.)

I bought a new faucet for my wife's kitchen sink and the threads were messed up (probably banged up during production, brass is kind of soft) on it right out of the box. Rather than return the item and wait for a new one, I got this die, chased the thread to the correct size and installed it with no problem. Took two days. Excellent quality, worked as advertised. Would recommend.