Internal Tool Single A Nc-171-187 N/C Counterbore, Sharp Cutter Built for Long Tool Life, Pro Grade Annular Cutter for Fast, Clean Big Holes, Tough Core Cutter for Mag Drills and Steel Work

Internal Tool Single A Nc-171-187 N/C Counterbore
✔️ Single counterbore, 171-187, Mag Drill Ready, Long Tool Life

The Internal Tool A Nc-171-187 N/C Counterbore is an annular cutter for fast, clean, large holes in steel with a magnetic drill. It's a go-to in structural steel, shipyards and fab shops. This listing is for one single item.

✅ Brand: Internal Tool
✅ Mfr part number: 85-1711
✅ Product type: Counterbore
✅ Pack size: Single, 1 piece
✅ Thread size: 171-187

💡 HSS vs carbide tipped annular cutters, which should I choose?

It depends on the material and how many holes you cut.

• HSS cutters are a solid all around pick for mild steel.
• Carbide tipped cutters last longer and cut stainless and hard steel.
• Cobalt cutters handle heat in tougher alloys.

Grab the Internal Tool A Nc-171-187 N/C Counterbore and get the job done right.