1、The key material of the product is diamond, which has very high hardness and long service life. 2、The product is suitable for various types of grinding machines, grinding wheel trimming. 3、Clears unwanted debris and impurities from your grinding wheels revealing sharp clean cutting surfaces. 4、The axial direction of the diamond pen is at an angle of 15 degrees to the radial direction of the grinding wheel. The dressing amount during trimming is generally 0.02-0.04 mm, and the speed should be uniform.​ 5、The axial direction of the diamond pen is at an angle of 15 degrees to the radial direction of the grinding wheel. The dressing amount during trimming is generally 0.02-0.04 mm, and the speed should be uniform. Feature: The key material of the product is diamond, which has very high hardness and long service life. The product is suitable for various types of grinding machines, grinding wheel trimming. Clears unwanted debris and impurities from your grinding wheels revealing sharp clean cutting surfaces. Simple and practical tool to get your grinding wheel working again. The axial direction of the diamond pen is at an angle of 15 degrees to the radial direction of the grinding wheel. The dressing amount during trimming is generally 0.02- 0.04 mm, and the speed should be uniform. Specification: Material: Diamond Diamond grit: 0.15; 0.2(Optional) Length: 45mm / 1.8in Package list: 1 *  Diamond Dressing Tool Note: The actual product color may deviate from the photo due to light. Coolant should be added when dressing the grinding wheel. It is strictly forbidden to cool after heat. There may be a slight deviation in the measurement of product.