Squares and triangles are the most popular, and all shapes are available in coarse, medium and fine grits in either aluminum oxide or black silicon carbide. Choose your shape according to the area that needs honing, and the tightest fit should be selected. The rounds and half-rounds are best for contoured surfaces. GRIER supplies all the common sizes in each shape: 1/4”x4”, 3/8”x4”, 1/2”x4”, 1/2”x6”, 3/4”x6”, 1”x6”
