Diamond Tools, a division of the FIE group established in 1968, is recognised as a pioneer in the manufacture of STD. Hardness Test Blocks, Diamond Indenters, and Ball Indenters for Hardness Testing Machines. DT has been a pioneer in the supply of various types of hardness test blocks, diamond indenters, and ball indenters for around 50 years. DT successfully met the expectations of hardness testing and supplies products to a prestigious list of companies and governmental institutions. Our goal