3 Piece Spiral Flute Step Drill Kit This premium Harlingen Spiral Flute Step Drill Set delivers smooth, efficient cutting performance across a wide range of hole sizes. Designed for consistent material removal, the spiral flute geometry ensures cooler operation, reduced chatter, and clean, precise results in metal, plastic, and composite materials. Ideal for workshop, automotive, fabrication, and electrical applications. Drill 1 – 6 mm Shank (9 Steps – 5 mm per Cut)Covers essential small-diameter holes with 9 incremental cuts.Sizes included: 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm. Drill 2 – 8 mm Shank (9 Steps – 5 mm per Cut)A versatile mid-range step drill suitable for general fabrication and panel work.Sizes included: 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm. Drill 3 – 10 mm Shank (14 Steps – 5 mm per Cut)Wide-range high-capacity step drill designed for larger hole requirements.Sizes included:4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm. Key Features: Spiral flute design for smoother, cooler cutting. Clean and consistent material removal on each step. 5 mm depth per cut for precise incremental sizing. Covers a full range from 4 mm to 30 mm across three drills. Suitable for steel, aluminium, plastic and sheet metal applications.
