Dense flute drills are fully ground drills,only its flute is more dense than normal fully ground drills.

the dense flute can draw crash out fastly to prevent the crash conflict the drills.so it make drills

working life is longer than normal drills.

such drill bits can be din338,ansi b94.11m and so on.

drill bits surface color can be: bright finished,black finished,titanium coated,black flute & coffee back,

black flute& bright back.

drill bits size can be: 1mm--13mm or 1/16"--1/2"