Micro-Mark Desktop Dust Collection System Filter, Medium location_F439 six-flute design makes smooth 82

six-flute design makes smooth 82 degree countersinks for flush mounting flat head screws in wood

They're also used for sharpening steel and carbide tipped cutting tools

Works with mixed materials

plastic 20 cc and 40 cc with graduations

It also makes an outstanding covered diorama base

Micro-Mark Desktop Dust Collection System Filter, Medium location_F439 six-flute design makes smooth 82HEPA Filter for use with the Micro Mark Desktop Dust Collection System #90535 Removes airborne particles Effective for dust, pollen, mold, bacteria and other particulates 99. 97% efficiency 4" x 3" Designed for the Micro Mark Desktop Dusty Collection System