Union Butterfield 4608 5/8In 82 Degree 3 Flute High Speed Steel Center Reamer Countersink 5011101

Widely Used to Countersink Screw Heads and Rivet Heads, and Countersink Holes for Lateh Centers. The Odd Number of Flutes Eliminates Chatter in Most Applications While Providing Better Accuracy than a Single-flute.