... . Shot peening 4. Sand blasting 5. Pre-treatment 6.marble cutting Hardness: (1)>40-50HRC: With this hardness, bearing steel grit ... and reliable performance,even size , good abrasion resistance,more sharp for cutting, cut fast, and make the marble with a more smooth ... , and operator and workers’ health. Angular bearing steel grit used for marble cutting , skype:qt.1131 QQ:1742625742 Tel:008615966055683