German GCT Diamond coated tools are based on HF-CVD technology. Specially GCT is very famous in Europe at the many applications because its multi-layer diamond coating's performance is so powerful. If you try to test newly with GCT tool, you will meet the unbelievable outcome. Pls select one item from the below for your change : [Micro Drill : GCT Type 1625 ] Diamond coated Micro Drill to make micro holes at ceramic plate such as Al2O3, AlN, Y2O3, ZrO2, Si3N4, SiC, Quartz.. Available diameters are 0.1, 0.15, 0.18, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.52, 0.55, 0.6, 0.65, 0.7....1.5.[End-Mill : GCT Type 1312 & 1322] Diamond coated end-mill for Metal PCB routing process (1)Type 1312 is for Metal (copper) Based High Heat Dissipation PCB. (2)Type 1322 is for Metal (Aluminum) Based High Heat Dissipation PCB. You can believe the multi-layer diamond coated tool's performance when you meet GCT tools from Germany.