The Norton MT-134 Diamond Sharpening Stone, 4 x 3/8-Inch is a bench sharpening stone from Norton, coated in diamond abrasive rather than the standard India oil-stone material, sized 4 x 3/8-inch. It’s built for gunsmiths and shooters who touch up an edge or a trigger contact surface at the bench rather than sending it out. Norton has made abrasive stones for over a century, and this size and cut is a common pick for detail sharpening work that a full-size bench stone is too coarse or too large to handle. Keep it in the toolbox next to your files and punches.

Key Specifications

• Coated in diamond abrasive, which cuts faster and holds its edge longer than a standard oil stone on hardened steel.
• Sized at 4 x 3/8-inch, small enough for detail work a full bench stone can’t reach.

Frequently Asked Questions

What is this stone coated with? Diamond abrasive, per the MT-134 designation, rather than the India oil-stone material used elsewhere in Norton’s line.

What size is it? 4 x 3/8-inch, a compact size for detail sharpening.

Buy the Norton MT-134 Diamond Sharpening Stone, 4 x 3/8-Inch

A stone that’s actually sized for the job beats fighting a bench stone that’s too big for the surface in front of you. Order it from our gunsmithing tools and supplies selection for fast shipping direct to your door.