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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