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Faithfull Step drills are used for cutting varying hole sizes in material up to 4 mm thick without changing the drill bit. Each drill cuts parallel holes within a specific size range, rising in 2mm increments.Sizes 6 to 30 mm. Increments of 2.0 mm. Max thickness 4 mm. Made from HSS ( High-Speed Steel ). Shank: 10 mm diameter.Additional Information:• Min. Size (mm): 6• Max. Size (mm): 30• No. Steps: 13