7/8" 82° HSS 6-Flute Chatterless Countersink 12" Cobalt Aircraft Number Drills Super hard titanium nitride surface

Super hard titanium nitride surface treatment improves drill life

PILOT SIZE #21 DECIMAL EQUIVALENT

Diameter: 5/32″

Threaded countersink cutters can be used in adjustable or micro-stop countersinking tools with a 1/4-28 threaded drive

Round shank for use in a wide range of tool holding systems

7/8" 82° HSS 6-Flute Chatterless Countersink 12" Cobalt Aircraft Number Drills Super hard titanium nitride surfaceSpecifications SIZE 7 8" OVERALL LENGTH 2 3 4" MATERIAL HIGH SPEED STEEL FINISH UNCOATED (BRIGHT) SHANK DIAMETER 1 2" NUMBER OF FLUTES 6 SHANK TYPE ROUND CUTTING ANGLE 82 SUGGESTED PACK QTY 1 6 flute countersinks, also known as chatterless countersinks, are designed to remove more metal compared to countersinks with fewer flutes. They are also more effective on harder materials and provide a more chatter free cut.