... range 1,Instruction The bit crown of electroplated diamond core bits are electroplated with layers of synthetic ... We offered all kinds of usual size electroplated diamond core bits,all the bits are manufactured under certificate ... need.2,Features1,much faster penetration than impregnated diamond core bits2,much more durable than the normal ones3 ... 3,Pic.s1p,2p,3p, Electroplated Diamond Core Bits for Sale