No.1. 4-12mm Hole Sizes in 2mm increments; No.2. 4-20mm Hole Sizes in 2mm increments; No.3. 4-30mm Hole Sizes in 2mm increments;Shank sizes No.1 - 6mm No.2 - 8mm No.3 - 10mm; Made of High Grade High Speed Steel Heat Treated and Highly Polished

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