The zero flute design is a single hole drilled through the head of the cutter, which makes it virtually chatter-free. And since it has no flutes to shift inside the hole, the cutter always stays on center.

Features:

5 pc 60° ANGLE HSS ZERO-FLUTE #0-#4 COUNTERSINK & DEBURRING TOOL

Size	Diameter Range	ShankSize
#0	1/8" - 15/64"	1/4" (Double End)
#1	3/16" - 13/32"	1/4"
#2	5/16" - 17/32"	1/4"
#3	7/16" - 25/32"	1/2"
#4	11/16" - 1-3/32"	1/2"

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