1" 120° HSS 3-Flute Countersink 12" HSS Aircraft Fractional Drills The surface is treated with

The surface is treated with abrasion-resistant black oxide

Size #4-#5 (Screw) Overall Length 1-1/2" Material High Speed Steel Finish Uncoated (Bright) Shank Size 1/4" Style Weldon Cutting Angle 82 Suggested Pack QTY 1

They feature carbide cutting edges for wear resistance and a steel shank for toughness

PILOT SIZE #40 DECIMAL EQUIVALENT

6-flute countersinks

1" 120° HSS 3-Flute Countersink 12" HSS Aircraft Fractional Drills The surface is treated withSpecifications SIZE 1" OVERALL LENGTH 3 1 2" MATERIAL HIGH SPEED STEEL FINISH UNCOATED (BRIGHT) SHANK DIAMETER 1 2" NUMBER OF FLUTES 3 SHANK TYPE ROUND CUTTING ANGLE 120 SUGGESTED PACK QTY 1 3 flute countersinks, also known as center reamers, are commonly used to countersink holes for centers or to enlarge existing holes.