Century Drill & Tool Tap National Pipe Thread Size:97204 - 1/2-14 NPT Also works great for chestnuts

Also works great for chestnuts

fire blockade caulk

Tension spring stabilizes jaw and allows easy knurl adjustment

1/2" to 1-1/4"

Century Drill & Tool Tap National Pipe Thread Size:97204 - 1/2-14 NPT Also works great for chestnutsProduct Code: 95203 Heat treated and tempered for file hard threads and longer useful life Designed for hand cutting applications National pipe thread tap sizes for internal threading on all types of pipes Best drill: 37 64 Product Code: 97204 Carbon steel tap offers precision cut threads, accurately formed for consistent, exact threading Heat treated and tempered for file hard threads and longer useful life Designed for hand cutting applications