... :ST0014-A3 2.Diamond Sintered Core Bits 1/2" gas 3.material:diamond 4.sintered We have the following workshops: 1. Workshop 1: diamond electroplated ... discs, diamond grinding discs, diamond resin grinding wheels, etc. 2. Workshop 2: tungsten carbide burrs: inch size and metric size, all standard ... , the USA and Australia ST0014-A3 Diamond Sintered Core Bits 1/2" gas