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By Accusize Industrial Tools
The 13 pcs interchange counterbore and their correspondent pilot chart: Counterbore Size: 1/4''; Pilot Hole Size: 3/32"; Range of Pilot Sizes: 1/8"-3/16"; Shank for Counterbore:15/64"; Overall Length: 3-13/16" Counterbore Size: 5/16''; Pilot Hole...