Precision Twist Drill Surface Treated H.S.S. Jobbers Length Twist Drill, 5/16″ Size, .3125″ Decimal Diameter, 4-1/2″ Overall Length

• H.S.S. – High Speed Steel
• Hardness: 58 to 60 RC
• Series: R10B
• Surface treatment increases abrasion resistance, reducing the amount of chip welding & improving chip flow
• Drill Point Angle: 135
• Point Sharpening Type: Split Point
• Finish Coating: Black Oxide
• Right hand (clockwise rotation) cutting direction
• Shank Style: Straight Shank
• Standard two flute design.
• Standard spiral, helical flutes.
• Workpiece Material Range: Steel, Cast Iron, Plastics

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