DRILLCO - 7/8,CHATTERLESS COUNTERSINK 82DEG 6 FLUT - 39E156B

Six Flute Chatterless countersinks are designed for fast shearing cuts, minimal chatter and lower vibrations.
most common angles for countersinking available; 60°, 82°, 90°
6 flutes for very fast shearing cuts
higher flute count reduces chip size and chatter