1" 90° HSS 3-Flute Countersink 12" HSS Aircraft Letter Drills Single flute countersinks are great

Single flute countersinks are great for chamfering

1590" BODY DIAMETER 1/2" MATERIAL HIGH SPEED STEEL THREAD SIZE 1/4-28 CUTTING ANGLE 100° SUGGESTED PACK QTY 1

also known as machine countersinks

QTY 1 STE3HEX (1/4" - 3/4" x 16ths)

Ideal for hard metals

1" 90° HSS 3-Flute Countersink 12" HSS Aircraft Letter Drills Single flute countersinks are greatSpecifications 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 90 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.