Counterbore set

Counterbore set for 3/8" 7/16" 1/2" 5/8" cap head allen screws.
Indexable carbide shank
Shank size 1/2" and 5/8"
Industrial quality

Cap screw size Outer diameter Shank Length No. of flutes
3/8” 19/32” ½” 4 3/8” 1
7/16” 11/16” ½” 4 7/16” 1
½” 25/32” 5/8” 4 ½” 1
5/8” 31/32” 5/8” 4 5/8” 2