sako243
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- 3,192
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- My mansion in Wales
As @Kram said they are fibreglass and copper (usually). Because you're usually drilling small holes (1.5mm is the largest I drill regularly and down to 0.5mm) you need a very rigid and very fast setup. I think our hand drill press runs at about 20krpm.I have seen PCB drill bits, but assumed they were only for drilling plastics, pcb's etc.