HSS 7pcs/set Cap Screw Counterbore set.

Including:

 #6----------0.22" pilot dia.

 #8----------0.28" pilot dia.

#10----------0.32" pilot dia.

 1/4"---------0.36" pilot dia.

5/16"--------0.45" pilot dia.

3/8"----------0.55" pilot dia.

1/2"---------0.70" pilot dia.

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