Extra long type twist drill

Extended-Length Taper Shank Twist Drill – a heavy-duty drill bit with a Morse taper shank for direct spindle mounting, featuring an extra-long flute and overall length for deep-hole drilling. Key points: · Taper shank – Morse taper ensures secure, chuck-free grip; flat tang prevents slipping. · Extended length – provides greater reach for deep cavities or thick workpieces, but requires reduced speed and increased pecking to clear chips. · Material – typically HSS or M35 cobalt for heat resistance in demanding operations. · Point – standard 118° or 135° split point. Common use: Deep-hole drilling in lathes, milling machines, and large boring mills