Brass threaded insert for stainless steel thumb screw Ergonomic plastic housing Made in USA Designed for use with the Lansky Controlled Angle Sharpening System. Diamond Coatings are the most abrasive type of sharpener and ideal for modern, wear-resistant tool steels. Available in 4 grits: fine, medium, coarse, and extra coarse for all of your sharpening needs.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }