Used almost exclusively for deep hole drilling of medium to large diameter holes (approximately 3⁄4–4 in or 19–102 mm diameter). An ejector drill bit uses a specially designed carbide cutter at the point. The bit body is essentially a tube within a tube. Flushing water travels down between the two tubes. Chip removal is back through the center of the bit.
Patented Chipbreaker Tooth Design Patent # GB2278793 and GB23197393