Viking 1/2″, 135 Drill Point Super Premium H.S.S. Jobbers Length Twist Drill

• Super Premium High Speed Steel
• Much tougher than cobalt steel.
• Thin web design penetrates work hardening stainless steel fast enough to continually cut beneath the chip which is hardening from deformation.
• 135 split point design stops drill walking, holds tighter hole size and takes a smaller chip resulting in less heat.
• Low temperature stress relief improves lubricity and toughness.
• Ultra Bor Super Premium drills are made of special Hi-moly tool steel, which is much tougher than cobalt steel.
• Heavy-duty Jobbers length twist drills.
• Premium grade high-speed steel construction.
• Lower helix angle of 30 wraps slowly and is used in drilling hard materials.
• Two-flutes design with straight body shank.
• Right hand (clockwise) cutting direction.
• Manufactured to NAS 907B specification.
• Nitro-Carburized flute has an increased rockwell hardness.
• Rich amber color.
• 135 split point geometry (over 1.5mm).
• Finish Coating: Bronze
• Hardness: 58 to 60 RC

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