https://www.optcuttingtools.com/
Thread Tap, Drill Bit, End Mill, Diamond Cutter - OPT
Shenzhen OPT Cutting Tool Co., Ltd. one of the leading manufacture in China, specializes in developping and producing carbide and PCD diamond tools. OPT offers
drill bitend milldiamond cutterthreadtap
https://www.made-in-china.com/Tools-Hardware-Catalog/Diamond-Cutter.html
China Manufacturer for Diamond Cutter Tools & Hardware, Wholesale and Suppliers
china manufacturerdiamond cuttertools hardwareand supplierswholesale