#10 3 Flute Capscrew Counterbore, High Speed Steel
Model #: CBCS-10
Price: $10.30
Description: #10 Capscrew Counterbore, 3 Flute, HSS, 1182-0010
- Screw Size: #10
 - Pilot Diameter: 13/64"
 - Cutter Diameter: 21/64"
 - Shank Diameter: 5/16"
 - High speed steel, for socket cap screws.
 
Used to countersink holes for Socket Cap Screws. 
Larger pilots than 2-flute solid counterbores. 
Straight shank.