Number: 28pcs. [28 Pcs Woodworking Chamfer Drilling Tools]. [7 Pcs Countersink Drill Bit]. [7 Pcs Countersink Drill Bit] Made of 45 carbon steel, with high hardness and wear resistance. Sizes include 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, suitable for drilling iron plates, aluminum plates, wood, PVC plates, and insulation boards.
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