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1/8" Diameter Holes 3/16" Diameter Holes 1/4" Diameter Holes
5/16" Diameter Holes 3/8" Diameter Holes 7/16" Diameter Holes
1/2" Diameter Holes 9/16" Diameter Holes 7/32" Diameter Holes
3-3/16" overall length (Note: Length may vary slightly due to sharpening). This length will work in all Challenge drill models.