Diamond brazed drill bits using special technology, vacuum brazed diamond, diamond and the substrate to ensure a solid, a blade because of its high chip removal space, ensure maximum sharpness. Can be used wet and dry, add water, a better effect. Long life, high efficiency, is an excellent alternative to electroplating. Diameter:15-100mm.Connection: Straight shank 6-12mm. Different arbor sizes and diameter are available upom request.