%(Cylindrical shaped). Ideal for sharpening, deburring and general purpose grinding. All have 1/8" shanks. No. 8153: 3/16" diameter, 3/8" thick No. 8175: 3/8" diameter, 3/8" thick No. 8193: 5/8" diameter, 3/8" thick No. 8215: 1" diameter, 1/8" thick