Fast cutting, aluminum oxide stone, six inches long and one inch square, lets you make a long, steady stroke and turn out those glass sharp, silky-smooth trigger jobs that make shooting a joy. One inch square size offers excellent steadiness and good visibility. Lubricate with stoning/honing oil. Excellent for many other stoning jobs too. MF-76 Medium is perfect for fast cleanup of manufacturing burrs found in most new guns. A few quick strokes in the jig results in a much smoother trigger pull. FF-76 Fine offers an excellent combination of speed and smoothness of cut to put a final finish on trigger parts for a crisp, smooth, trigger pull. Mfg: Norton SPECS: Aluminum oxide. 6" (15.2cm) x 1" (2.5cm) x 1".