Nicholson Machinist's Boxed Half-Round File, 12in - Used on concave, convex and flat surfaces. Rounded on 1 side, flat on opposite. Backs of all half-round bastard files are double-cut. Backs of all 4 and 6" files are single-cut. Backs of all half-round second-cut files are longer than 6" are double-cut.
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